patch 9.1.1425: tabpanel: there are still some problems with the tabpanel

Commit: 
https://github.com/vim/vim/commit/3b9b95dc63c9db85ae827e66a1f2d7830264ccf3
Author: Hirohito Higashi <h.east....@gmail.com>
Date:   Sun Jun 1 20:22:55 2025 +0200

    patch 9.1.1425: tabpanel: there are still some problems with the tabpanel
    
    Problem:  tabpanel: there are still some problems with the tabpanel with
              column handling
    Solution: fix the problems and refactor Tabpanel feature (Hirohito
              Higashi).
    
    fixes: #17423
    fixes: #17332
    closes: #17336
    
    Signed-off-by: Hirohito Higashi <h.east....@gmail.com>
    Signed-off-by: Christian Brabandt <c...@256bit.org>

diff --git a/runtime/doc/builtin.txt b/runtime/doc/builtin.txt
index a15a20aa5..8cce98a3f 100644
--- a/runtime/doc/builtin.txt
+++ b/runtime/doc/builtin.txt
@@ -1,4 +1,4 @@
-*builtin.txt*  For Vim version 9.1.  Last change: 2025 May 28
+*builtin.txt*  For Vim version 9.1.  Last change: 2025 Jun 01
 
 
                  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -4728,10 +4728,9 @@ getmousepos()                                            
*getmousepos()*
                                        start of the clicked char
                All numbers are 1-based.
 
-               If not over a window, e.g. when in the command line, then only
-               "screenrow" and "screencol" are valid, the others are zero.
-
-               When on the |tabpanel|, "wincol" value is zero.
+               If not over a window, e.g. when in the command line or within
+               |tabpanel|, then only "screenrow" and "screencol" are valid,
+               the others are zero.
 
                When on the status line below a window or the vertical
                separator right of a window, the "line" and "column" values
diff --git a/src/clipboard.c b/src/clipboard.c
index d0feb2ff1..fb967dc40 100644
--- a/src/clipboard.c
+++ b/src/clipboard.c
@@ -404,7 +404,7 @@ clip_invert_rectangle(
        gui_mch_invert_rectangle(row, col, height, width);
     else
 #endif
-       screen_draw_rectangle(row, col + TPL_LCOL(NULL), height, width, invert);
+       screen_draw_rectangle(row, col, height, width, invert);
 #ifdef FEAT_PROP_POPUP
     screen_zindex = 0;
 #endif
diff --git a/src/drawline.c b/src/drawline.c
index 3be9a3a4d..84a1d895b 100644
--- a/src/drawline.c
+++ b/src/drawline.c
@@ -875,7 +875,7 @@ wlv_screen_line(win_T *wp, winlinevars_T *wlv, int 
clear_end)
        }
     }
 
-    screen_line(wp, wlv->screen_row, wp->w_wincol + TPL_LCOL(wp), wlv->col,
+    screen_line(wp, wlv->screen_row, wp->w_wincol, wlv->col,
                    clear_end ? wp->w_width : -wp->w_width,
                    wlv->vcol - 1, wlv->screen_line_flags);
 }
@@ -4355,7 +4355,7 @@ win_line(
 #ifdef FEAT_PROP_POPUP
                     && !text_prop_above && !text_prop_follows
 #endif
-                    && wp->w_width == COLUMNS_WITHOUT_TPL())
+                    && wp->w_width == Columns)
            {
                // Remember that the line wraps, used for modeless copy.
                LineWraps[wlv.screen_row - 1] = TRUE;
@@ -4380,7 +4380,7 @@ win_line(
                                                                          == 2
                                 || (*mb_off2cells)(
                                     LineOffset[wlv.screen_row - 1]
-                                                           + 
(int)COLUMNS_WITHOUT_TPL() - 2,
+                                                           + 
(int)topframe->fr_width - 2,
                                     LineOffset[wlv.screen_row]
                                                      + screen_Columns) == 2)))
                {
@@ -4390,17 +4390,17 @@ win_line(
                    // auto-wrap, we overwrite the character.
                    if (screen_cur_col != wp->w_width)
                        screen_char(LineOffset[wlv.screen_row - 1]
-                                                      + 
(unsigned)COLUMNS_WITHOUT_TPL() - 1,
-                                      wlv.screen_row - 1, 
(int)(COLUMNS_WITHOUT_TPL() - 1));
+                                                      + 
(unsigned)topframe->fr_width - 1,
+                                      wlv.screen_row - 1, 
(int)(topframe->fr_width - 1));
 
                    // When there is a multi-byte character, just output a
                    // space to keep it simple.
                    if (has_mbyte && MB_BYTE2LEN(ScreenLines[LineOffset[
-                                    wlv.screen_row - 1] + 
(COLUMNS_WITHOUT_TPL() - 1)]) > 1)
+                                    wlv.screen_row - 1] + (topframe->fr_width 
- 1)]) > 1)
                        out_char(' ');
                    else
                        out_char(ScreenLines[LineOffset[wlv.screen_row - 1]
-                                                           + 
(COLUMNS_WITHOUT_TPL() - 1)]);
+                                                           + 
(topframe->fr_width - 1)]);
                    // force a redraw of the first char on the next line
                    ScreenAttrs[LineOffset[wlv.screen_row]] = (sattr_T)-1;
                    screen_start();     // don't know where cursor is now
diff --git a/src/drawscreen.c b/src/drawscreen.c
index 1e71caef1..60b76d57c 100644
--- a/src/drawscreen.c
+++ b/src/drawscreen.c
@@ -541,13 +541,13 @@ win_redr_status(win_T *wp, int ignore_pum UNUSED)
            plen = this_ru_col - 1;
        }
 
-       screen_puts(p, row, wp->w_wincol + TPL_LCOL(wp), attr);
-       screen_fill(row, row + 1, plen + wp->w_wincol + TPL_LCOL(wp),
-                       this_ru_col + wp->w_wincol + TPL_LCOL(wp), fillchar, 
fillchar, attr);
+       screen_puts(p, row, wp->w_wincol, attr);
+       screen_fill(row, row + 1, plen + wp->w_wincol,
+                       this_ru_col + wp->w_wincol, fillchar, fillchar, attr);
        if ((NameBufflen = get_keymap_str(wp, (char_u *)"<%s>", NameBuff, 
MAXPATHL)) > 0
                && (this_ru_col - plen) > (NameBufflen + 1))
            screen_puts(NameBuff, row, (int)(this_ru_col - NameBufflen
-                                                  - 1 + wp->w_wincol + 
TPL_LCOL(wp)), attr);
+                                                  - 1 + wp->w_wincol), attr);
 
        win_redr_ruler(wp, TRUE, ignore_pum);
 
@@ -572,8 +572,7 @@ win_redr_status(win_T *wp, int ignore_pum UNUSED)
            fillchar = fillchar_status(&attr, wp);
        else
            fillchar = fillchar_vsep(&attr, wp);
-       if (W_ENDCOL(wp) < COLUMNS_WITHOUT_TPL())
-           screen_putchar(fillchar, row, W_ENDCOL(wp) + TPL_LCOL(wp), attr);
+       screen_putchar(fillchar, row, W_ENDCOL(wp), attr);
     }
     busy = FALSE;
 }
@@ -798,11 +797,11 @@ win_redr_ruler(win_T *wp, int always, int ignore_pum)
            buffer[bufferlen] = NUL;
        }
 
-       screen_puts(buffer, row, this_ru_col + off + TPL_LCOL(wp), attr);
+       screen_puts(buffer, row, this_ru_col + off, attr);
        n1 = redraw_cmdline;
        screen_fill(row, row + 1,
-               this_ru_col + off + bufferlen + TPL_LCOL(wp),
-               (off + width) + TPL_LCOL(wp),
+               this_ru_col + off + bufferlen,
+               (off + width),
                fillchar, fillchar, attr);
        // don't redraw the cmdline because of showing the ruler
        redraw_cmdline = n1;
@@ -1043,7 +1042,7 @@ redraw_win_toolbar(win_T *wp)
     }
     wp->w_winbar_items[item_idx].wb_menu = NULL; // end marker
 
-    screen_line(wp, wp->w_winrow, wp->w_wincol + TPL_LCOL(wp), wp->w_width,
+    screen_line(wp, wp->w_winrow, wp->w_wincol, wp->w_width,
                                                          wp->w_width, -1, 0);
 }
 #endif
@@ -1378,8 +1377,8 @@ fold_line(
     }
 #endif
 
-    screen_line(wp, row + W_WINROW(wp), wp->w_wincol + TPL_LCOL(wp),
-                                               wp->w_width, wp->w_width, -1, 
0);
+    screen_line(wp, row + W_WINROW(wp), wp->w_wincol, wp->w_width, wp->w_width,
+           -1, 0);
 
     // Update w_cline_height and w_cline_folded if the cursor line was
     // updated (saves a call to plines() later).
@@ -2613,13 +2612,16 @@ win_update(win_T *wp)
 
        for (k = 0; k < Rows; ++k)
            if (enc_utf8)
-               if ((*mb_off2cells)(LineOffset[k] + Columns - 2,
+               if ((*mb_off2cells)(LineOffset[k] + topframe->fr_width - 2,
                                           LineOffset[k] + screen_Columns) > 1)
-                   screen_draw_rectangle(k, Columns - 2, 1, 2, FALSE);
+                   screen_draw_rectangle(k, topframe->fr_width - 2, 1, 2,
+                           FALSE);
                else
-                   screen_draw_rectangle(k, Columns - 1, 1, 1, FALSE);
+                   screen_draw_rectangle(k, topframe->fr_width - 1, 1, 1,
+                           FALSE);
            else
-               screen_char(LineOffset[k] + Columns - 1, k, Columns - 1);
+               screen_char(LineOffset[k] + topframe->fr_width - 1, k,
+                       Columns - 1);
     }
 #endif
 
@@ -2689,8 +2691,8 @@ win_update(win_T *wp)
            // Last line isn't finished: Display "@@@" at the end.
            screen_fill(W_WINROW(wp) + wp->w_height - 1,
                    W_WINROW(wp) + wp->w_height,
-                   (start_col < wp->w_wincol ? wp->w_wincol : start_col) + 
TPL_LCOL(wp),
-                   (int)W_ENDCOL(wp) + TPL_LCOL(wp),
+                   (start_col < wp->w_wincol ? wp->w_wincol : start_col),
+                   (int)W_ENDCOL(wp),
                    symbol, symbol, HL_ATTR(HLF_AT));
            set_empty_rows(wp, srow);
            wp->w_botline = lnum;
diff --git a/src/edit.c b/src/edit.c
index 366108883..b4e6767f2 100644
--- a/src/edit.c
+++ b/src/edit.c
@@ -1716,7 +1716,7 @@ edit_putchar(int c, int highlight)
 
            if (fix_col != pc_col)
            {
-               screen_putchar(' ', pc_row, fix_col + TPL_LCOL(NULL), attr);
+               screen_putchar(' ', pc_row, fix_col, attr);
                --curwin->w_wcol;
                pc_status = PC_STATUS_RIGHT;
            }
@@ -1736,7 +1736,7 @@ edit_putchar(int c, int highlight)
        screen_getbytes(pc_row, pc_col, pc_bytes, &pc_attr);
        pc_status = PC_STATUS_SET;
     }
-    screen_putchar(c, pc_row, pc_col + TPL_LCOL(NULL), attr);
+    screen_putchar(c, pc_row, pc_col, attr);
 }
 
 #if defined(FEAT_JOB_CHANNEL) || defined(PROTO)
diff --git a/src/ex_docmd.c b/src/ex_docmd.c
index a92946558..08d2c1e66 100644
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -8234,7 +8234,7 @@ ex_sleep(exarg_T *eap)
     {
        n = W_WINROW(curwin) + curwin->w_wrow - msg_scrolled;
        if (n >= 0)
-           windgoto(n, curwin->w_wincol + curwin->w_wcol + TPL_LCOL(curwin));
+           windgoto(n, curwin->w_wincol + curwin->w_wcol);
     }
 
     len = eap->line2;
diff --git a/src/gui.c b/src/gui.c
index 41647d61d..fbbfb8721 100644
--- a/src/gui.c
+++ b/src/gui.c
@@ -4907,8 +4907,6 @@ xy2win(int x, int y, mouse_find_T popup)
     row = Y_2_ROW(y);
     col = X_2_COL(x);
 
-    col -= TPL_LCOL(NULL);
-
     if (row < 0 || col < 0)            // before first window
        return NULL;
     wp = mouse_find_win(&row, &col, popup);
@@ -5379,8 +5377,6 @@ gui_wingoto_xy(int x, int y)
     int                col = X_2_COL(x);
     win_T      *wp;
 
-    col -= TPL_LCOL(NULL);
-
     if (row < 0 || col < 0)
        return;
 
diff --git a/src/mouse.c b/src/mouse.c
index 65540e555..0d05e643d 100644
--- a/src/mouse.c
+++ b/src/mouse.c
@@ -479,9 +479,11 @@ do_mouse(
 
     start_visual.lnum = 0;
 
-    // Check for clicking in the tab page line.
+    // Check for clicking in the tab page panel.
 #if defined(FEAT_TABPANEL)
-    if (mouse_col < TPL_LCOL(NULL))
+    if (mouse_row < firstwin->w_winrow + topframe->fr_height
+       && (mouse_col < firstwin->w_wincol
+               || mouse_col >= firstwin->w_wincol + topframe->fr_width))
     {
        if (is_drag)
        {
@@ -499,7 +501,7 @@ do_mouse(
 # ifdef FEAT_CMDWIN
                && cmdwin_type == 0
 # endif
-               && mouse_col < Columns)
+               )
        {
            in_tabpanel = TRUE;
            c1 = get_tabpagenr_on_tabpanel();
@@ -568,7 +570,8 @@ do_mouse(
            }
 
            // click in a tab selects that tab page
-           if (is_click && cmdwin_type == 0 && mouse_col < Columns)
+           if (is_click && cmdwin_type == 0
+                   && mouse_col < firstwin->w_wincol + topframe->fr_width)
            {
                in_tab_line = TRUE;
                c1 = TabPageIdxs[mouse_col];
@@ -1725,10 +1728,6 @@ jump_to_mouse(
     int                mouse_char = ' ';
 #endif
 
-    col -= TPL_LCOL(NULL);
-    if (col < 0)
-       return IN_TABPANEL;
-
     mouse_past_bottom = FALSE;
     mouse_past_eol = FALSE;
 
@@ -1813,7 +1812,7 @@ retnomove:
 
     if (!(flags & MOUSE_FOCUS))
     {
-       if (row < 0 || col + TPL_LCOL(NULL) < 0) // check if it makes sense
+       if (row < 0 || col < 0) // check if it makes sense
            return IN_UNKNOWN;
 
        // find the window where the row is in and adjust "row" and "col" to be
@@ -3220,7 +3219,14 @@ mouse_find_win(int *rowp, int *colp, mouse_find_T popup 
UNUSED)
 #endif
 
     fp = topframe;
+
+    if (*colp < firstwin->w_wincol
+           || *colp >= firstwin->w_wincol + fp->fr_width
+           || *rowp < firstwin->w_winrow)
+       return NULL;
+
     *rowp -= firstwin->w_winrow;
+    *colp -= firstwin->w_wincol;
     for (;;)
     {
        if (fp->fr_layout == FR_LEAF)
@@ -3333,9 +3339,6 @@ f_getmousepos(typval_T *argvars UNUSED, typval_T *rettv)
            winid = wp->w_id;
            winrow = row + 1;
            wincol = col + 1;
-           wincol -= TPL_LCOL(NULL);
-           if (wincol < 0)
-               wincol = 0;
            row -= top_off;
            col -= left_off;
            if (row >= 0 && row < wp->w_height && col >= 0 && col < wp->w_width)
diff --git a/src/popupmenu.c b/src/popupmenu.c
index 6d91c33ee..fb32017f3 100644
--- a/src/popupmenu.c
+++ b/src/popupmenu.c
@@ -658,25 +658,22 @@ pum_display_rtl_text(
        width = cells + over_cell + 1;
        rt = orig_rt;
 
-       screen_putchar(truncrl, row,
-               col - width + 1 + TPL_LCOL(NULL), trunc_attr);
+       screen_putchar(truncrl, row, col - width + 1, trunc_attr);
 
        if (over_cell > 0)
-           screen_fill(row, row + 1, col - width + 2 + TPL_LCOL(NULL),
-                   col - width + 2 + over_cell + TPL_LCOL(NULL), ' ', ' ',
-                   attr);
+           screen_fill(row, row + 1, col - width + 2,
+                   col - width + 2 + over_cell, ' ', ' ', attr);
     }
 
     if (attrs == NULL)
-       screen_puts_len(rt, (int)STRLEN(rt), row,
-               col - cells + 1 + TPL_LCOL(NULL), attr);
+       screen_puts_len(rt, (int)STRLEN(rt), row, col - cells + 1, attr);
     else
-       pum_screen_puts_with_attrs(row, col - cells + 1 + TPL_LCOL(NULL),
-               cells, rt, (int)STRLEN(rt), attrs);
+       pum_screen_puts_with_attrs(row, col - cells + 1, cells, rt,
+               (int)STRLEN(rt), attrs);
 
     vim_free(rt_start);
     VIM_CLEAR(st);
-    return col - width + TPL_LCOL(NULL);
+    return col - width;
 }
 #endif
 
@@ -750,19 +747,17 @@ pum_display_ltr_text(
     }
 
     if (attrs == NULL)
-       screen_puts_len(st, size, row, col + TPL_LCOL(NULL), attr);
+       screen_puts_len(st, size, row, col, attr);
     else
-       pum_screen_puts_with_attrs(row, col + TPL_LCOL(NULL), cells, st, size,
-               attrs);
+       pum_screen_puts_with_attrs(row, col, cells, st, size, attrs);
 
     if (truncated)
     {
        if (over_cell > 0)
-           screen_fill(row, row + 1, col + cells + TPL_LCOL(NULL),
-                   col + cells + over_cell + TPL_LCOL(NULL), ' ', ' ', attr);
+           screen_fill(row, row + 1, col + cells,
+                   col + cells + over_cell, ' ', ' ', attr);
 
-       screen_putchar(trunc, row,
-               col + cells + over_cell + TPL_LCOL(NULL), trunc_attr);
+       screen_putchar(trunc, row, col + cells + over_cell, trunc_attr);
     }
 
     VIM_CLEAR(st);
@@ -873,10 +868,10 @@ pum_draw_scrollbar(
 
 #ifdef FEAT_RIGHTLEFT
     if (pum_rl)
-       screen_putchar(' ', row, pum_col - pum_width + TPL_LCOL(NULL), attr);
+       screen_putchar(' ', row, pum_col - pum_width, attr);
     else
 #endif
-       screen_putchar(' ', row, pum_col + pum_width + TPL_LCOL(NULL), attr);
+       screen_putchar(' ', row, pum_col + pum_width, attr);
 }
 
 /*
@@ -959,12 +954,12 @@ pum_redraw(void)
        if (pum_rl)
        {
            if (pum_col < curwin->w_wincol + curwin->w_width - 1)
-               screen_putchar(' ', row, pum_col + 1 + TPL_LCOL(NULL), attr);
+               screen_putchar(' ', row, pum_col + 1, attr);
        }
        else
 #endif
            if (pum_col > 0)
-               screen_putchar(' ', row, pum_col - 1 + TPL_LCOL(NULL), attr);
+               screen_putchar(' ', row, pum_col - 1, attr);
 
        // Display each entry, use two spaces for a Tab.
        // Do this 3 times and order from p_cia
@@ -1005,16 +1000,15 @@ pum_redraw(void)
 #ifdef FEAT_RIGHTLEFT
            if (pum_rl)
            {
-               screen_fill(row, row + 1, pum_col - basic_width - n + 1 + 
TPL_LCOL(NULL),
-                                               col + 1 + TPL_LCOL(NULL), ' ', 
' ', orig_attr);
+               screen_fill(row, row + 1, pum_col - basic_width - n + 1,
+                                               col + 1, ' ', ' ', orig_attr);
                col = pum_col - basic_width - n;
            }
            else
 #endif
            {
-               screen_fill(row, row + 1, col + TPL_LCOL(NULL),
-                       pum_col + basic_width + n + TPL_LCOL(NULL), ' ', ' ',
-                       orig_attr);
+               screen_fill(row, row + 1, col, pum_col + basic_width + n,
+                                                       ' ', ' ', orig_attr);
                col = pum_col + basic_width + n;
            }
            totwidth = basic_width + n;
@@ -1022,14 +1016,12 @@ pum_redraw(void)
 
 #ifdef FEAT_RIGHTLEFT
        if (pum_rl)
-           screen_fill(row, row + 1,
-                   pum_col - pum_width + 1 + TPL_LCOL(NULL),
-                   col + 1 + TPL_LCOL(NULL), ' ', ' ', orig_attr);
+           screen_fill(row, row + 1, pum_col - pum_width + 1, col + 1, ' ',
+                                                           ' ', orig_attr);
        else
 #endif
-           screen_fill(row, row + 1, col + TPL_LCOL(NULL),
-                   pum_col + pum_width + TPL_LCOL(NULL),
-                   ' ', ' ', orig_attr);
+           screen_fill(row, row + 1, col, pum_col + pum_width, ' ', ' ',
+                                                               orig_attr);
        pum_draw_scrollbar(row, i, thumb_pos, thumb_height);
 
        ++row;
diff --git a/src/popupwin.c b/src/popupwin.c
index a9a284377..199ffaf8d 100644
--- a/src/popupwin.c
+++ b/src/popupwin.c
@@ -86,7 +86,7 @@ popup_options_one(dict_T *dict, char_u *key)
     if (STRCMP(key, "line") == 0)
        n = screen_screenrow() + 1 + n;
     else // "col"
-       n = screen_screencol() + 1 + n - TPL_LCOL(NULL);
+       n = screen_screencol() + 1 + n;
 
     // Zero means "not set", use -1 instead.
     if (n == 0)
@@ -1354,15 +1354,15 @@ popup_adjust_position(win_T *wp)
        {
            wp->w_wincol = wantcol - 1;
            // Need to see at least one character after the decoration.
-           if (wp->w_wincol > Columns - left_extra - 1)
-               wp->w_wincol = Columns - left_extra - 1;
+           if (wp->w_wincol > firstwin->w_wincol + topframe->fr_width - 
left_extra - 1)
+               wp->w_wincol = firstwin->w_wincol + topframe->fr_width - 
left_extra - 1;
        }
     }
 
     // When centering or right aligned, use maximum width.
     // When left aligned use the space available, but shift to the left when we
     // hit the right of the screen.
-    maxspace = Columns - wp->w_wincol - left_extra;
+    maxspace = firstwin->w_wincol + topframe->fr_width - wp->w_wincol - 
left_extra;
     maxwidth = maxspace;
     if (wp->w_maxwidth > 0 && maxwidth > wp->w_maxwidth)
     {
@@ -1545,7 +1545,7 @@ popup_adjust_position(win_T *wp)
     }
     if (center_hor)
     {
-       wp->w_wincol = (Columns - wp->w_width - extra_width - TPL_LCOL(NULL)) / 
2;
+       wp->w_wincol = (firstwin->w_wincol + topframe->fr_width - wp->w_width - 
extra_width) / 2;
        if (wp->w_wincol < 0)
            wp->w_wincol = 0;
     }
@@ -1581,9 +1581,9 @@ popup_adjust_position(win_T *wp)
        // try to show the right border and any scrollbar
        want_col = left_extra + wp->w_width + right_extra;
        if (want_col > 0 && wp->w_wincol > 0
-                                        && wp->w_wincol + want_col >= Columns)
+                                        && wp->w_wincol + want_col >= 
firstwin->w_wincol + topframe->fr_width)
        {
-           wp->w_wincol = Columns - want_col;
+           wp->w_wincol = firstwin->w_wincol + topframe->fr_width - want_col;
            if (wp->w_wincol < 0)
                wp->w_wincol = 0;
        }
@@ -1673,6 +1673,13 @@ popup_adjust_position(win_T *wp)
     else if (wp->w_winrow < 0)
        wp->w_winrow = 0;
 
+    if (wp->w_wincol + wp->w_width > firstwin->w_wincol + topframe->fr_width)
+       wp->w_wincol = firstwin->w_wincol + topframe->fr_width - wp->w_width;
+    else if (wp->w_wincol < firstwin->w_wincol)
+       wp->w_wincol = firstwin->w_wincol;
+    if (wp->w_wincol < 0)
+       wp->w_wincol = 0;
+
     if (wp->w_height != org_height)
        win_comp_scroll(wp);
 
@@ -4081,7 +4088,7 @@ update_popups(void (*win_update)(win_T *wp))
        // win_update() doesn't handle them.
        top_off = popup_top_extra(wp);
        left_extra = wp->w_popup_padding[3] + wp->w_popup_border[3]
-               + TPL_LCOL(NULL) - wp->w_popup_leftoff;
+                                                       - wp->w_popup_leftoff;
        if (wp->w_wincol + left_extra < 0)
            left_extra = -wp->w_wincol;
        wp->w_winrow += top_off;
@@ -4163,7 +4170,7 @@ update_popups(void (*win_update)(win_T *wp))
        }
 
        // Title goes on top of border or padding.
-       title_wincol = wp->w_wincol + 1 + TPL_LCOL(NULL);
+       title_wincol = wp->w_wincol + 1;
        if (wp->w_popup_title != NULL)
        {
            title_len = vim_strsize(wp->w_popup_title);
@@ -4191,7 +4198,7 @@ update_popups(void (*win_update)(win_T *wp))
                      wp->w_popup_border[0] > 0 ? border_attr[0] : popup_attr);
        }
 
-       wincol = wp->w_wincol - wp->w_popup_leftoff + TPL_LCOL(NULL);
+       wincol = wp->w_wincol - wp->w_popup_leftoff;
        top_padding = wp->w_popup_padding[0];
        if (wp->w_popup_border[0] > 0)
        {
@@ -4229,7 +4236,7 @@ update_popups(void (*win_update)(win_T *wp))
        {
            padcol = wincol + wp->w_popup_border[3];
            padendcol = wp->w_wincol + total_width - wp->w_popup_border[1]
-                   + TPL_LCOL(NULL) - wp->w_has_scrollbar;
+                                                       - wp->w_has_scrollbar;
            if (padcol < 0)
            {
                padendcol += padcol;
@@ -4327,7 +4334,7 @@ update_popups(void (*win_update)(win_T *wp))
            if (wp->w_has_scrollbar)
            {
                int line = i - top_off;
-               int scroll_col = wp->w_wincol + total_width - 1 + TPL_LCOL(NULL)
+               int scroll_col = wp->w_wincol + total_width - 1
                                                       - wp->w_popup_border[1];
 
                if (line >= 0 && line < wp->w_height)
diff --git a/src/screen.c b/src/screen.c
index d8a060f0c..f262cf4c0 100644
--- a/src/screen.c
+++ b/src/screen.c
@@ -156,13 +156,13 @@ screen_fill_end(
     if (wp->w_p_rl)
     {
        screen_fill(W_WINROW(wp) + row, W_WINROW(wp) + endrow,
-               W_ENDCOL(wp) - nn + TPL_LCOL(wp), (int)W_ENDCOL(wp) - off + 
TPL_LCOL(wp),
+               W_ENDCOL(wp) - nn, (int)W_ENDCOL(wp) - off,
                c1, c2, attr);
     }
     else
 #endif
        screen_fill(W_WINROW(wp) + row, W_WINROW(wp) + endrow,
-               wp->w_wincol + off + TPL_LCOL(wp), (int)wp->w_wincol + nn + 
TPL_LCOL(wp),
+               wp->w_wincol + off, (int)wp->w_wincol + nn,
                c1, c2, attr);
     return nn;
 }
@@ -215,18 +215,15 @@ win_draw_end(
     if (wp->w_p_rl)
     {
        screen_fill(W_WINROW(wp) + row, W_WINROW(wp) + endrow,
-               wp->w_wincol + TPL_LCOL(wp), W_ENDCOL(wp) - 1 - n +
-               TPL_LCOL(wp), c2, c2, attr);
+               wp->w_wincol, W_ENDCOL(wp) - 1 - n, c2, c2, attr);
        screen_fill(W_WINROW(wp) + row, W_WINROW(wp) + endrow,
-               W_ENDCOL(wp) - 1 - n + TPL_LCOL(wp), W_ENDCOL(wp) - n +
-               TPL_LCOL(wp), c1, c2, attr);
+               W_ENDCOL(wp) - 1 - n, W_ENDCOL(wp) - n, c1, c2, attr);
     }
     else
 #endif
     {
        screen_fill(W_WINROW(wp) + row, W_WINROW(wp) + endrow,
-               wp->w_wincol + n + TPL_LCOL(wp), (int)W_ENDCOL(wp) + 
TPL_LCOL(wp),
-               c1, c2, attr);
+               wp->w_wincol + n, (int)W_ENDCOL(wp), c1, c2, attr);
     }
 
     set_empty_rows(wp, row);
@@ -369,6 +366,9 @@ char_needs_redraw(int off_from, int off_to, int cols)
                            && ScreenLines[off_from + 1]
                                                != ScreenLines[off_to + 1])))))
        return TRUE;
+    // TODO: This is a temporary solution until the root cause is fixed.
+    if (firstwin->w_wincol > 0)
+       return TRUE;
     return FALSE;
 }
 
@@ -395,9 +395,7 @@ blocked_by_popup(int row, int col)
 
     if (!popup_visible)
        return FALSE;
-    if (col < TPL_LCOL(NULL))
-       return FALSE;
-    off = row * screen_Columns + col - TPL_LCOL(NULL);
+    off = row * screen_Columns + col;
     return popup_mask[off] > screen_zindex || popup_transparent[off];
 }
 #endif
@@ -857,7 +855,7 @@ screen_line(
     {
        // For a window that has a right neighbor, draw the separator char
        // right of the window contents.  But not on top of a popup window.
-       if (coloff + col < TPL_LCOL(NULL) + COLUMNS_WITHOUT_TPL())
+       if (coloff + col < firstwin->w_wincol + topframe->fr_width)
        {
            if (!skip_for_popup(row, col + coloff))
            {
@@ -922,14 +920,10 @@ draw_vsep_win(win_T *wp, int row)
     if (!wp->w_vsep_width)
        return;
 
-    if (COLUMNS_WITHOUT_TPL() <= W_ENDCOL(wp) + 1)
-       return;
-
     // draw the vertical separator right of this window
     c = fillchar_vsep(&hl, wp);
     screen_fill(W_WINROW(wp) + row, W_WINROW(wp) + wp->w_height,
-           W_ENDCOL(wp) + TPL_LCOL(wp), W_ENDCOL(wp) + 1 + TPL_LCOL(wp),
-           c, ' ', hl);
+           W_ENDCOL(wp), W_ENDCOL(wp) + 1, c, ' ', hl);
 }
 
 /*
@@ -1056,9 +1050,10 @@ win_redr_custom(
        // Use 'tabline'.  Always at the first line of the screen.
        stl = p_tal;
        row = 0;
+       col = firstwin->w_wincol;
        fillchar = ' ';
        attr = HL_ATTR(HLF_TPF);
-       maxwidth = COLUMNS_WITHOUT_TPL();
+       maxwidth = topframe->fr_width;
        opt_name = (char_u *)"tabline";
     }
     else
@@ -1155,7 +1150,7 @@ win_redr_custom(
     for (n = 0; hltab[n].start != NULL; n++)
     {
        len = (int)(hltab[n].start - p);
-       screen_puts_len(p, len, row, col + TPL_LCOL(wp), curattr);
+       screen_puts_len(p, len, row, col, curattr);
        col += vim_strnsize(p, len);
        p = hltab[n].start;
 
@@ -1176,12 +1171,12 @@ win_redr_custom(
        else
            curattr = highlight_user[hltab[n].userhl - 1];
     }
-    screen_puts(p, row, col + TPL_LCOL(wp), curattr);
+    screen_puts(p, row, col, curattr);
 
     if (wp == NULL)
     {
        // Fill the TabPageIdxs[] array for clicking in the tab pagesline.
-       col = 0;
+       col = firstwin->w_wincol;
        len = 0;
        p = buf;
        fillchar = 0;
@@ -1193,7 +1188,7 @@ win_redr_custom(
            p = tabtab[n].start;
            fillchar = tabtab[n].userhl;
        }
-       while (col < COLUMNS_WITHOUT_TPL())
+       while (col < Columns)
            TabPageIdxs[col++] = fillchar;
     }
 
@@ -2132,15 +2127,15 @@ redraw_block(int row, int end, win_T *wp)
 
     if (wp == NULL)
     {
-       col = 0;
-       width = COLUMNS_WITHOUT_TPL();
+       col = firstwin->w_wincol;
+       width = topframe->fr_width;
     }
     else
     {
        col = wp->w_wincol;
        width = wp->w_width;
     }
-    screen_draw_rectangle(row, col + TPL_LCOL(wp), end - row, width, FALSE);
+    screen_draw_rectangle(row, col, end - row, width, FALSE);
 }
 
     void
@@ -2918,11 +2913,6 @@ linecopy(int to, int from, win_T *wp)
     unsigned   off_to = LineOffset[to] + wp->w_wincol;
     unsigned   off_from = LineOffset[from] + wp->w_wincol;
 
-#if defined(FEAT_TABPANEL)
-    off_to += TPL_LCOL(wp);
-    off_from += TPL_LCOL(wp);
-#endif
-
     mch_memmove(ScreenLines + off_to, ScreenLines + off_from,
            wp->w_width * sizeof(schar_T));
     if (enc_utf8)
@@ -3256,7 +3246,7 @@ setcursor_mayforce(int force)
                           && (*mb_ptr2cells)(ml_get_cursor()) == 2
                           && vim_isprintc(gchar_cursor())) ? 2 : 1)) :
 #endif
-                                           curwin->w_wcol) + TPL_LCOL(NULL));
+                                           curwin->w_wcol));
     }
 }
 
@@ -3326,8 +3316,7 @@ win_ins_lines(
        if (lastrow > Rows)
            lastrow = Rows;
        screen_fill(nextrow - line_count, lastrow - line_count,
-                 wp->w_wincol + TPL_LCOL(wp), (int)W_ENDCOL(wp) + TPL_LCOL(wp),
-                 ' ', ' ', 0);
+                 wp->w_wincol, (int)W_ENDCOL(wp), ' ', ' ', 0);
     }
 
     if (screen_ins_lines(0, W_WINROW(wp) + row, line_count, (int)Rows, 0, NULL)
@@ -3425,7 +3414,7 @@ win_do_lines(
 
     // only a few lines left: redraw is faster
     if (mayclear && Rows - line_count < 5
-           && wp->w_width == COLUMNS_WITHOUT_TPL())
+           && wp->w_width == topframe->fr_width)
     {
        if (!no_win_do_lines_ins)
            screenclear();          // will set wp->w_lines_valid to 0
@@ -3442,8 +3431,7 @@ win_do_lines(
     if (row + line_count >= wp->w_height)
     {
        screen_fill(W_WINROW(wp) + row, W_WINROW(wp) + wp->w_height,
-               wp->w_wincol + TPL_LCOL(wp), (int)W_ENDCOL(wp) + TPL_LCOL(wp),
-               ' ', ' ', 0);
+               wp->w_wincol, (int)W_ENDCOL(wp), ' ', ' ', 0);
        return OK;
     }
 
@@ -3464,9 +3452,9 @@ win_do_lines(
      * a character in the lower right corner of the scroll region may cause a
      * scroll-up .
      */
-    if (scroll_region || wp->w_width != COLUMNS_WITHOUT_TPL())
+    if (scroll_region || wp->w_width != topframe->fr_width)
     {
-       if (scroll_region && (wp->w_width == COLUMNS_WITHOUT_TPL()
+       if (scroll_region && (wp->w_width == topframe->fr_width
                    || *T_CSV != NUL))
            scroll_region_set(wp, row);
        if (del)
@@ -3475,7 +3463,7 @@ win_do_lines(
        else
            retval = screen_ins_lines(W_WINROW(wp) + row, 0, line_count,
                                           wp->w_height - row, clear_attr, wp);
-       if (scroll_region && (wp->w_width == COLUMNS_WITHOUT_TPL()
+       if (scroll_region && (wp->w_width == topframe->fr_width
                    || *T_CSV != NUL))
            scroll_region_reset();
        return retval;
@@ -3599,7 +3587,7 @@ screen_ins_lines(
      * exists.
      */
     result_empty = (row + line_count >= end);
-    if (wp != NULL && wp->w_width != COLUMNS_WITHOUT_TPL() && *T_CSV == NUL)
+    if (wp != NULL && wp->w_width != topframe->fr_width && *T_CSV == NUL)
     {
        // Avoid that lines are first cleared here and then redrawn, which
        // results in many characters updated twice.  This happens with CTRL-F
@@ -3645,7 +3633,7 @@ screen_ins_lines(
 #ifdef FEAT_CLIPBOARD
     // Remove a modeless selection when inserting lines halfway the screen
     // or not the full width of the screen.
-    if (off + row > 0 || (wp != NULL && wp->w_width != COLUMNS_WITHOUT_TPL()))
+    if (off + row > 0 || (wp != NULL && wp->w_width != topframe->fr_width))
        clip_clear_selection(&clip_star);
     else
        clip_scroll_selection(-line_count);
@@ -3677,7 +3665,7 @@ screen_ins_lines(
     end += off;
     for (i = 0; i < line_count; ++i)
     {
-       if (wp != NULL && wp->w_width != COLUMNS_WITHOUT_TPL())
+       if (wp != NULL && wp->w_width != topframe->fr_width)
        {
            // need to copy part of a line
            j = end - 1 - i;
@@ -3685,11 +3673,10 @@ screen_ins_lines(
                linecopy(j + line_count, j, wp);
            j += line_count;
            if (can_clear((char_u *)" "))
-               lineclear(LineOffset[j] + wp->w_wincol + TPL_LCOL(wp),
+               lineclear(LineOffset[j] + wp->w_wincol,
                        wp->w_width, clear_attr);
            else
-               lineinvalid(LineOffset[j] + wp->w_wincol + TPL_LCOL(wp),
-                       wp->w_width);
+               lineinvalid(LineOffset[j] + wp->w_wincol, wp->w_width);
            LineWraps[j] = FALSE;
        }
        else
@@ -3704,10 +3691,9 @@ screen_ins_lines(
            LineOffset[j + line_count] = temp;
            LineWraps[j + line_count] = FALSE;
            if (can_clear((char_u *)" "))
-               lineclear(temp + TPL_LCOL(wp), COLUMNS_WITHOUT_TPL(),
-                       clear_attr);
+               lineclear(temp, topframe->fr_width, clear_attr);
            else
-               lineinvalid(temp + TPL_LCOL(wp), COLUMNS_WITHOUT_TPL());
+               lineinvalid(temp, topframe->fr_width);
        }
     }
 
@@ -3840,7 +3826,7 @@ screen_del_lines(
      * 5. Use T_DL (delete line) if it exists.
      * 6. redraw the characters from ScreenLines[].
      */
-    if (wp != NULL && wp->w_width != COLUMNS_WITHOUT_TPL() && *T_CSV == NUL)
+    if (wp != NULL && wp->w_width != topframe->fr_width && *T_CSV == NUL)
     {
        // Avoid that lines are first cleared here and then redrawn, which
        // results in many characters updated twice.  This happens with CTRL-F
@@ -3863,7 +3849,7 @@ screen_del_lines(
     else if (*T_CDL != NUL && line_count > 1 && can_delete)
        type = USE_T_CDL;
     else if (can_clear(T_CE) && result_empty
-           && (wp == NULL || wp->w_width == COLUMNS_WITHOUT_TPL()))
+           && (wp == NULL || wp->w_width == topframe->fr_width))
        type = USE_T_CE;
     else if (*T_DL != NUL && can_delete)
        type = USE_T_DL;
@@ -3875,7 +3861,7 @@ screen_del_lines(
 #ifdef FEAT_CLIPBOARD
     // Remove a modeless selection when deleting lines halfway the screen or
     // not the full width of the screen.
-    if (off + row > 0 || (wp != NULL && wp->w_width != COLUMNS_WITHOUT_TPL()))
+    if (off + row > 0 || (wp != NULL && wp->w_width != topframe->fr_width))
        clip_clear_selection(&clip_star);
     else
        clip_scroll_selection(line_count);
@@ -3914,7 +3900,7 @@ screen_del_lines(
     end += off;
     for (i = 0; i < line_count; ++i)
     {
-       if (wp != NULL && wp->w_width != COLUMNS_WITHOUT_TPL())
+       if (wp != NULL && wp->w_width != topframe->fr_width)
        {
            // need to copy part of a line
            j = row + i;
@@ -3922,11 +3908,10 @@ screen_del_lines(
                linecopy(j - line_count, j, wp);
            j -= line_count;
            if (can_clear((char_u *)" "))
-               lineclear(LineOffset[j] + wp->w_wincol + TPL_LCOL(wp),
+               lineclear(LineOffset[j] + wp->w_wincol,
                        wp->w_width, clear_attr);
            else
-               lineinvalid(LineOffset[j] + wp->w_wincol + TPL_LCOL(wp),
-                       wp->w_width);
+               lineinvalid(LineOffset[j] + wp->w_wincol, wp->w_width);
            LineWraps[j] = FALSE;
        }
        else
@@ -3942,10 +3927,9 @@ screen_del_lines(
            LineOffset[j - line_count] = temp;
            LineWraps[j - line_count] = FALSE;
            if (can_clear((char_u *)" "))
-               lineclear(temp + TPL_LCOL(NULL), COLUMNS_WITHOUT_TPL(),
-                       clear_attr);
+               lineclear(temp, (int)Columns, clear_attr);
            else
-               lineinvalid(temp + TPL_LCOL(NULL), COLUMNS_WITHOUT_TPL());
+               lineinvalid(temp, (int)Columns);
        }
     }
 
@@ -4333,7 +4317,7 @@ draw_tabline(void)
                                            );
 
 #if defined(FEAT_TABPANEL)
-    col = TPL_LCOL(NULL);
+    col = firstwin->w_wincol;
 #endif
 
     if (ScreenLines == NULL)
@@ -4364,7 +4348,7 @@ draw_tabline(void)
        FOR_ALL_TABPAGES(tp)
            ++tabcount;
 
-       tabwidth = (COLUMNS_WITHOUT_TPL() - 1 + tabcount / 2) / tabcount;
+       tabwidth = (topframe->fr_width - 1 + tabcount / 2) / tabcount;
        if (tabwidth < 6)
            tabwidth = 6;
 
diff --git a/src/tabpanel.c b/src/tabpanel.c
index 599e434cb..3845faa8f 100644
--- a/src/tabpanel.c
+++ b/src/tabpanel.c
@@ -164,7 +164,7 @@ draw_tabpanel(void)
     int                row = 0;
     int                off = 0;
 #endif
-int            vsrow = 0;
+    int                vsrow = 0;
     int                is_right = tpl_align == ALIGN_RIGHT;
 
     if (maxwidth == 0)
@@ -198,14 +198,10 @@ int               vsrow = 0;
                    maxwidth - VERT_LEN, &curtab_row, NULL);
            do_by_tplmode(TPLMODE_REDRAW, VERT_LEN, maxwidth, &curtab_row,
                    NULL);
-           // clear for multi-byte vert separater
-           screen_fill(0, cmdline_row, COLUMNS_WITHOUT_TPL(),
-                   COLUMNS_WITHOUT_TPL() + VERT_LEN,
-                   TPL_FILLCHAR, TPL_FILLCHAR, vs_attr);
-           // draw vert separater in tabpanel
+           // draw vert separator in tabpanel
            for (vsrow = 0; vsrow < cmdline_row; vsrow++)
                screen_putchar(curwin->w_fill_chars.tpl_vert, vsrow,
-                       COLUMNS_WITHOUT_TPL(), vs_attr);
+                       topframe->fr_width, vs_attr);
        }
        else
        {
@@ -214,10 +210,7 @@ int                vsrow = 0;
                    &curtab_row, NULL);
            do_by_tplmode(TPLMODE_REDRAW, 0, maxwidth - VERT_LEN,
                    &curtab_row, NULL);
-           // clear for multi-byte vert separater
-           screen_fill(0, cmdline_row, maxwidth - VERT_LEN,
-                   maxwidth, TPL_FILLCHAR, TPL_FILLCHAR, vs_attr);
-           // draw vert separater in tabpanel
+           // draw vert separator in tabpanel
            for (vsrow = 0; vsrow < cmdline_row; vsrow++)
                screen_putchar(curwin->w_fill_chars.tpl_vert, vsrow,
                        maxwidth - VERT_LEN, vs_attr);
@@ -272,8 +265,8 @@ screen_fill_tailing_area(
     int is_right = tpl_align == ALIGN_RIGHT;
     if (tplmode == TPLMODE_REDRAW)
        screen_fill(row_start, row_end,
-               (is_right ? COLUMNS_WITHOUT_TPL() : 0) + col_start,
-               (is_right ? COLUMNS_WITHOUT_TPL() : 0) + col_end,
+               (is_right ? topframe->fr_width : 0) + col_start,
+               (is_right ? topframe->fr_width : 0) + col_end,
                TPL_FILLCHAR, TPL_FILLCHAR, attr);
 }
 
@@ -356,7 +349,7 @@ screen_puts_len_for_tabpanel(
            if (*pargs->pcol + chcells <= pargs->col_end)
            {
                int off = (tpl_align == ALIGN_RIGHT)
-                       ? COLUMNS_WITHOUT_TPL()
+                       ? topframe->fr_width
                        : 0;
                if (TPLMODE_REDRAW == tplmode
                        && (*pargs->prow - pargs->offsetrow >= 0
@@ -628,7 +621,7 @@ do_by_tplmode(
                    p++;
                }
 
-               while (p[i] != '
' && p[i] != '
' && (p[i] != NUL))
+               while (p[i] != '
' && p[i] != '
' && p[i] != NUL)
                {
                    if (i + 1 >= sizeof(buf))
                        break;
diff --git a/src/term.c b/src/term.c
index 2d2c94061..bf5636129 100644
--- a/src/term.c
+++ b/src/term.c
@@ -3630,7 +3630,17 @@ win_new_shellsize(void)
     if (old_Columns != Columns)
     {
        old_Columns = Columns;
-       shell_new_columns();    // update window sizes
+
+       tabpage_T *save_curtab = curtab;
+       tabpage_T *tp;
+       FOR_ALL_TABPAGES(tp)
+       {
+           unuse_tabpage(curtab);
+           use_tabpage(tp);
+           shell_new_columns();
+       }
+       unuse_tabpage(curtab);
+       use_tabpage(save_curtab);
     }
 }
 
@@ -4454,16 +4464,9 @@ scroll_region_set(win_T *wp, int off)
 {
     OUT_STR(tgoto((char *)T_CS, W_WINROW(wp) + wp->w_height - 1,
                                                         W_WINROW(wp) + off));
-#if defined(FEAT_TABPANEL)
-    if (*T_CSV != NUL)
-       OUT_STR(tgoto((char *)T_CSV,
-               wp->w_wincol + wp->w_width - 1 + TPL_LCOL(NULL),
-               wp->w_wincol + TPL_LCOL(NULL)));
-#else
-    if (*T_CSV != NUL && wp->w_width != Columns)
+    if (*T_CSV != NUL && wp->w_width != topframe->fr_width)
        OUT_STR(tgoto((char *)T_CSV, wp->w_wincol + wp->w_width - 1,
                                                               wp->w_wincol));
-#endif
     screen_start();                // don't know where cursor is now
 }
 
@@ -4475,7 +4478,7 @@ scroll_region_reset(void)
 {
     OUT_STR(tgoto((char *)T_CS, (int)Rows - 1, 0));
     if (*T_CSV != NUL)
-       OUT_STR(tgoto((char *)T_CSV, COLUMNS_WITHOUT_TPL() - 1, 0));
+       OUT_STR(tgoto((char *)T_CSV, topframe->fr_width - 1, 0));
     screen_start();                // don't know where cursor is now
 }
 
diff --git a/src/terminal.c b/src/terminal.c
index a0758409e..921b234de 100644
--- a/src/terminal.c
+++ b/src/terminal.c
@@ -1351,7 +1351,7 @@ update_cursor(term_T *term, int redraw)
        // do not use the window cursor position
        position_cursor(curwin, &curbuf->b_term->tl_cursor_pos);
        windgoto(W_WINROW(curwin) + curwin->w_wrow,
-                curwin->w_wincol + curwin->w_wcol + TPL_LCOL(NULL));
+                curwin->w_wincol + curwin->w_wcol);
     }
     if (redraw)
     {
@@ -4120,8 +4120,7 @@ term_update_window(win_T *wp)
 #ifdef FEAT_MENU
                                + winbar_height(wp)
 #endif
-                               , wp->w_wincol + TPL_LCOL(wp), pos.col,
-                               wp->w_width, -1,
+                               , wp->w_wincol, pos.col, wp->w_width, -1,
 #ifdef FEAT_PROP_POPUP
                                popup_is_popup(wp) ? SLF_POPUP :
 #endif
diff --git a/src/testdir/dumps/Test_tabpanel_dont_overflow_into_tabpanel_0.dump 
b/src/testdir/dumps/Test_tabpanel_dont_overflow_into_tabpanel_0.dump
index 5fd8f9b11..6076978d0 100644
--- a/src/testdir/dumps/Test_tabpanel_dont_overflow_into_tabpanel_0.dump
+++ b/src/testdir/dumps/Test_tabpanel_dont_overflow_into_tabpanel_0.dump
@@ -7,4 +7,4 @@
 | +1#0000000&@9|~+0#4040ff13&| @33
 | +1#0000000&@9|~+0#4040ff13&| @33
 | +1#0000000&@9|~+0#4040ff13&| @33
-| +0#0000000&@36|1|,|1| @4
+| +0#0000000&@26|1|,|1| @10|A|l@1| 
diff --git a/src/testdir/dumps/Test_tabpanel_drawing_01.dump 
b/src/testdir/dumps/Test_tabpanel_drawing_01.dump
index 860154222..74ba073e0 100644
--- a/src/testdir/dumps/Test_tabpanel_drawing_01.dump
+++ b/src/testdir/dumps/Test_tabpanel_drawing_01.dump
@@ -3,4 +3,4 @@
 | +1#0000000&@15|~+0#4040ff13&| @27
 | +1#0000000&@15|~+0#4040ff13&| @27
 | +1#0000000&@15|~+0#4040ff13&| @27
-| +0#0000000&@26|0|,|0|-|1| @8|A|l|0|,
+| +0#0000000&@26|0|,|0|-|1| @8|A|l@1| 
diff --git a/src/testdir/dumps/Test_tabpanel_drawing_04.dump 
b/src/testdir/dumps/Test_tabpanel_drawing_04.dump
index 61b759e67..dd3c82e1a 100644
--- a/src/testdir/dumps/Test_tabpanel_drawing_04.dump
+++ b/src/testdir/dumps/Test_tabpanel_drawing_04.dump
@@ -3,4 +3,4 @@
 | +1&&@15|f+0&&| @27
 | +1&&@15|~+0#4040ff13&| @27
 | +1#0000000&@15|~+0#4040ff13&| @27
-| +0#0000000&@42|1|,
+| +0#0000000&@26|1|,|1| @10|A|l@1| 
diff --git a/src/testdir/dumps/Test_tabpanel_drawing_05.dump 
b/src/testdir/dumps/Test_tabpanel_drawing_05.dump
index e9ea7cbdb..08e040bdf 100644
--- a/src/testdir/dumps/Test_tabpanel_drawing_05.dump
+++ b/src/testdir/dumps/Test_tabpanel_drawing_05.dump
@@ -3,4 +3,4 @@
 | +2&&@15|f+0&&| @27
 |2+2&&|:|X+0#4040ff13&|t|a|b|p|a|n|e|l|2| +2#0000000&@3|~+0#4040ff13&| @27
 | +1#0000000&@15|~+0#4040ff13&| @27
-| +0#0000000&@42|1|,
+| +0#0000000&@26|1|,|1| @10|A|l@1| 
diff --git a/src/testdir/dumps/Test_tabpanel_drawing_fill_tailing_0.dump 
b/src/testdir/dumps/Test_tabpanel_drawing_fill_tailing_0.dump
index 40e3bd74c..4ca56d419 100644
--- a/src/testdir/dumps/Test_tabpanel_drawing_fill_tailing_0.dump
+++ b/src/testdir/dumps/Test_tabpanel_drawing_fill_tailing_0.dump
@@ -7,4 +7,4 @@
 |b+2#0000000&@2|.|t|x|t| @12|~+0#4040ff13&| @23
 |B+2#0000000&|O|T@1|O|M| @13|~+0#4040ff13&| @23
 | +1#0000000&@19|~+0#4040ff13&| @23
-| +0#0000000&@44
+| +0#0000000&@26|0|,|0|-|1| @8|A|l@1| 
diff --git a/src/testdir/dumps/Test_tabpanel_drawing_pum_0.dump 
b/src/testdir/dumps/Test_tabpanel_drawing_pum_0.dump
index 190e5d99f..d98dbfdd6 100644
--- a/src/testdir/dumps/Test_tabpanel_drawing_pum_0.dump
+++ b/src/testdir/dumps/Test_tabpanel_drawing_pum_0.dump
@@ -1,10 +1,10 @@
-|a+8#0000001#e0e0e08@2|.|t|x|t| @12|!+0#0000000#ffffff0> @23
-|b+2&&@2|.|t|x|t| @12|!+0#0000001#e0e0e08| @14| +0#0000000#0000001| 
+0#4040ff13#ffffff0@7
-| +1#0000000&@19|#+0#0000001#ffd7ff255| @14| +0#0000000#a8a8a8255| 
+0#4040ff13#ffffff0@7
-| +1#0000000&@19|&+0#0000001#ffd7ff255| @14| +0#0000000#a8a8a8255| 
+0#4040ff13#ffffff0@7
-| +1#0000000&@19|*+0#0000001#ffd7ff255| @14| +0#0000000#a8a8a8255| 
+0#4040ff13#ffffff0@7
-| +1#0000000&@19|++0#0000001#ffd7ff255@1| @13| +0#0000000#a8a8a8255| 
+0#4040ff13#ffffff0@7
-| +1#0000000&@19|-+0#0000001#ffd7ff255@1| @13| +0#0000000#a8a8a8255| 
+0#4040ff13#ffffff0@7
-| +1#0000000&@19|<+0#0000001#ffd7ff255| @14| +0#0000000#a8a8a8255| 
+0#4040ff13#ffffff0@7
-| +1#0000000&@19|=+0#0000001#ffd7ff255| @14| +0#0000000#a8a8a8255| 
+0#4040ff13#ffffff0@7
-|-+2#0000000&@1| |m+0#00e0003&|a|t|c|h| |1| |o|f| |5|9|6| +0#0000000&@27
+|a+8#0000001#e0e0e08@2|.|t|x|t| @12|a+0#0000000#ffffff0@1> @22
+|++2&&| |b@2|.|t|x|t| @9| +0#0000001#e0e0e08|a@1| @12| +0#0000000#ffffff0@9
+| +1&&@18| +0#0000001#ffd7ff255|a@3| @10| +0#0000000#ffffff0@9
+| +1&&@18| +0#0000001#ffd7ff255|a@2|c| @10| +0#0000000#ffffff0@9
+| +1&&@18| +0#0000001#ffd7ff255|a@2|b| @10| +0#0000000#ffffff0@9
+| +1&&@19| +0&&@24
+| +1&&@19|~+0#4040ff13&| @23
+| +1#0000000&@19|~+0#4040ff13&| @23
+| +1#0000000&@19|~+0#4040ff13&| @23
+|-+2#0000000&@1| |m+0#00e0003&|a|t|c|h| |1| |o|f| |4| +0#0000000&@29
diff --git a/src/testdir/dumps/Test_tabpanel_drawing_pum_1.dump 
b/src/testdir/dumps/Test_tabpanel_drawing_pum_1.dump
index 9888bc0cc..17e0c971f 100644
--- a/src/testdir/dumps/Test_tabpanel_drawing_pum_1.dump
+++ b/src/testdir/dumps/Test_tabpanel_drawing_pum_1.dump
@@ -1,10 +1,10 @@
-|a+8#0000001#e0e0e08@2|.|t|x|t| @12|!+0#0000000#ffffff0| @23
-|++2&&| |b@2|.|t|x|t| @10| +0&&@1|a|b@1|r|e|v|i|a|t|e> @12
-| +1&&@19|~+0#4040ff13&| +0#0000001#e0e0e08|a|b@1|r|e|v|i|a|t|e| @4| 
+0#4040ff13#ffffff0@7
-| +1#0000000&@19|~+0#4040ff13&| +0#0000001#ffd7ff255|a|b|c|l|e|a|r| @7| 
+0#4040ff13#ffffff0@7
-| +1#0000000&@19|~+0#4040ff13&| +0#0000001#ffd7ff255|a|b|o|v|e|l|e|f|t| @5| 
+0#4040ff13#ffffff0@7
-| +1#0000000&@19|~+0#4040ff13&| +0#0000001#ffd7ff255|a|b|s|t|r|a|c|t| @6| 
+0#4040ff13#ffffff0@7
-| +1#0000000&@19|~+0#4040ff13&| @23
-| +1#0000000&@19|~+0#4040ff13&| @23
+|a+8#0000001#e0e0e08@2|.|t|x|t| @12|a+0#0000000#ffffff0@1| @22
+|++2&&| |b@2|.|t|x|t| @10|a+0&&@1| @22
+| +1&&@19|a+0&&| +0#0000001#ffd7ff255|a@1| @12| +0#0000000#ffffff0@7
+| +1&&@19|a+0&&| +0#0000001#ffd7ff255|a@3| @10| +0#0000000#ffffff0@7
+| +1&&@19|a+0&&| +0#0000001#ffd7ff255|a@2|c| @10| +0#0000000#ffffff0@7
+| +1&&@19| +0&&| +0#0000001#e0e0e08|a@2|b| @10| +0#0000000#ffffff0@7
+| +1&&@19| +0&&@1|a@2|b> @18
+| +1&&@19|~+0#4040ff13&| @23
 | +1#0000000&@19|~+0#4040ff13&| @23
 |-+2#0000000&@1| |m+0#00e0003&|a|t|c|h| |1| |o|f| |4| +0#0000000&@29
diff --git a/src/testdir/dumps/Test_tabpanel_drawing_pum_2.dump 
b/src/testdir/dumps/Test_tabpanel_drawing_pum_2.dump
new file mode 100644
index 000000000..4ea7b9140
--- /dev/null
+++ b/src/testdir/dumps/Test_tabpanel_drawing_pum_2.dump
@@ -0,0 +1,10 @@
+|a+0&#ffffff0@1| @22|a+8#0000001#e0e0e08@2|.|t|x|t| @12
+|a+0#0000000#ffffff0@1| @22|++2&&| |b@2|.|t|x|t| @10
+|a+0&&@3| @20| +1&&@19
+|a+0&&@2|c| @17| +0#0000001#e0e0e08|a@1| @12| +1#0000000#ffffff0@6
+|a+0&&@2|b| @17| +0#0000001#ffd7ff255|a@3| @10| +1#0000000#ffffff0@6
+| +0&&@21| +0#0000001#ffd7ff255|a@2|c| @10| +1#0000000#ffffff0@6
+| +0&&@21| +0#0000001#ffd7ff255|a@2|b| @10| +1#0000000#ffffff0@6
+| +0&&@22|a@1| +1&&@19
+>~+0#4040ff13&| @23| +1#0000000&@19
+|-+2&&@1| |m+0#00e0003&|a|t|c|h| |1| |o|f| |4| +0#0000000&@29
diff --git a/src/testdir/dumps/Test_tabpanel_drawing_with_popupwin_0.dump 
b/src/testdir/dumps/Test_tabpanel_drawing_with_popupwin_0.dump
index 080fa2788..7f390e77d 100644
--- a/src/testdir/dumps/Test_tabpanel_drawing_with_popupwin_0.dump
+++ b/src/testdir/dumps/Test_tabpanel_drawing_with_popupwin_0.dump
@@ -1,10 +1,10 @@
-|[+8#0000001#e0e0e08|N|o| |N|a|m|e|]| @10|╔+0#0000000#ffffff0|═|╗|.@18|╔|═|╗
-|[+2&&|S|c|r|a|t|c|h|]| @10|║+0&&|@|║|.@18|║|@|║
-| +1&&@19|╚+0&&|═|╝|.@5|a|t|c|u|r|s|o|r|.@4|╚|═|╝
-| +1&&@19|.+0&&@8>.@15
-| +1&&@19|.+0&&@24
-| +1&&@19|╔+0&&|═|╗|.@18|╔|═|╗
-| +1&&@19|║+0&&|@|║|.@18|║|@|║
-| +1&&@19|╚+0&&|═|╝|.@18|╚|═|╝
-| +1&&@19|.+0&&@24
+|╔+0#ffffff16#e000002|═|╗|.+0#0000000#ffffff0@38|╔+0#ffffff16#e000002|═|╗
+|║|@|║|.+0#0000000#ffffff0@38|║+0#ffffff16#e000002|@|║
+|╚|═|╝|.+0#0000000#ffffff0@38|╚+0#ffffff16#e000002|═|╝
+|.+0#0000000#ffffff0@8|a+0#00e0003&|t|c|u|r|s|o|r|.+0#0000000&@27
+@9>.@35
+@45
+@45
+@45
+@45
 | @44
diff --git a/src/testdir/dumps/Test_tabpanel_drawing_with_popupwin_1.dump 
b/src/testdir/dumps/Test_tabpanel_drawing_with_popupwin_1.dump
new file mode 100644
index 000000000..72cf385ac
--- /dev/null
+++ b/src/testdir/dumps/Test_tabpanel_drawing_with_popupwin_1.dump
@@ -0,0 +1,10 @@
+|[+8#0000001#e0e0e08|N|o| |N|a|m|e|]| 
@10|╔+0#ffffff16#e000002|═|╗|.+0#0000000#ffffff0@18|╔+0#ffffff16#e000002|═|╗
+|[+2#0000000#ffffff0|S|c|r|a|t|c|h|]| 
@10|║+0#ffffff16#e000002|@|║|.+0#0000000#ffffff0@18|║+0#ffffff16#e000002|@|║
+| 
+1#0000000#ffffff0@19|╚+0#ffffff16#e000002|═|╝|.+0#0000000#ffffff0@18|╚+0#ffffff16#e000002|═|╝
+| +1#0000000#ffffff0@19|a+0#00e0003&|t|c|u|r|s|o|r|.+0#0000000&@16
+| +1&&@19|.+0&&@8>.@15
+| +1&&@19|.+0&&@24
+| +1&&@19|.+0&&@24
+| +1&&@19|.+0&&@24
+| +1&&@19|.+0&&@24
+| @44
diff --git a/src/testdir/dumps/Test_tabpanel_drawing_with_popupwin_2.dump 
b/src/testdir/dumps/Test_tabpanel_drawing_with_popupwin_2.dump
new file mode 100644
index 000000000..bee1803c7
--- /dev/null
+++ b/src/testdir/dumps/Test_tabpanel_drawing_with_popupwin_2.dump
@@ -0,0 +1,10 @@
+|╔+0#ffffff16#e000002|═|╗|.+0#0000000#ffffff0@18|╔+0#ffffff16#e000002|═|╗|[+8#0000001#e0e0e08|N|o|
 |N|a|m|e|]| @10
+|║+0#ffffff16#e000002|@|║|.+0#0000000#ffffff0@18|║+0#ffffff16#e000002|@|║|[+2#0000000#ffffff0|S|c|r|a|t|c|h|]|
 @10
+|╚+0#ffffff16#e000002|═|╝|.+0#0000000#ffffff0@18|╚+0#ffffff16#e000002|═|╝| 
+1#0000000#ffffff0@19
+|.+0&&@8|a+0#00e0003&|t|c|u|r|s|o|r|.+0#0000000&@7| +1&&@19
+|.+0&&@8>.@15| +1&&@19
+|.+0&&@24| +1&&@19
+|.+0&&@24| +1&&@19
+|.+0&&@24| +1&&@19
+|.+0&&@24| +1&&@19
+| +0&&@44
diff --git 
a/src/testdir/dumps/Test_tabpanel_eval_tabpanel_statusline_tabline_0.dump 
b/src/testdir/dumps/Test_tabpanel_eval_tabpanel_statusline_tabline_0.dump
index 9214434ec..dd930c451 100644
--- a/src/testdir/dumps/Test_tabpanel_eval_tabpanel_statusline_tabline_0.dump
+++ b/src/testdir/dumps/Test_tabpanel_eval_tabpanel_statusline_tabline_0.dump
@@ -1,10 +1,10 @@
-|$+8#0000001#e0e0e08| |[|a@2|]| |$|│+1#0000000#ffffff0|$| @13|[|c@2|]| @13|$
-|$+8#0000001#e0e0e08| |[|b@2|]| |$|│+1#0000000#ffffff0> +0&&@34
-|$+2&&| |[|c@2|]| |$|│+1&&|~+0#4040ff13&| @33
-| +1#0000000&@8|│|~+0#4040ff13&| @33
-| +1#0000000&@8|│|~+0#4040ff13&| @33
-| +1#0000000&@8|│|~+0#4040ff13&| @33
-| +1#0000000&@8|│|~+0#4040ff13&| @33
-| +1#0000000&@8|│|~+0#4040ff13&| @33
-| +1#0000000&@8|│|$+3&&| @13|[|c@2|]| @13|$
+|$+8#0000001#e0e0e08| |[|a@2|]| |$||+1#0000000#ffffff0|$| @13|[|c@2|]| @13|$
+|$+8#0000001#e0e0e08| |[|b@2|]| |$||+1#0000000#ffffff0> +0&&@34
+|$+2&&| |[|c@2|]| |$||+1&&|~+0#4040ff13&| @33
+| +1#0000000&@8|||~+0#4040ff13&| @33
+| +1#0000000&@8|||~+0#4040ff13&| @33
+| +1#0000000&@8|||~+0#4040ff13&| @33
+| +1#0000000&@8|||~+0#4040ff13&| @33
+| +1#0000000&@8|||~+0#4040ff13&| @33
+| +1#0000000&@8|||$+3&&| @13|[|c@2|]| @13|$
 |"+0&&|c@2|"| |[|N|e|w|]| @33
diff --git 
a/src/testdir/dumps/Test_tabpanel_eval_tabpanel_statusline_tabline_1.dump 
b/src/testdir/dumps/Test_tabpanel_eval_tabpanel_statusline_tabline_1.dump
index dae0d0b05..21bb63b84 100644
--- a/src/testdir/dumps/Test_tabpanel_eval_tabpanel_statusline_tabline_1.dump
+++ b/src/testdir/dumps/Test_tabpanel_eval_tabpanel_statusline_tabline_1.dump
@@ -1,10 +1,10 @@
-|$+1&#ffffff0| @13|[|c@2|]| @13|$|│|$+8#0000001#e0e0e08| |[|a@2|]| |$
-> +0#0000000#ffffff0@34|│+1&&|$+8#0000001#e0e0e08| |[|b@2|]| |$
-|~+0#4040ff13#ffffff0| @33|│+1#0000000&|$+2&&| |[|c@2|]| |$
-|~+0#4040ff13&| @33|│+1#0000000&| @8
-|~+0#4040ff13&| @33|│+1#0000000&| @8
-|~+0#4040ff13&| @33|│+1#0000000&| @8
-|~+0#4040ff13&| @33|│+1#0000000&| @8
-|~+0#4040ff13&| @33|│+1#0000000&| @8
-|$+3&&| @13|[|c@2|]| @13|$|│+1&&| @8
+|$+1&#ffffff0| @13|[|c@2|]| @13|$|||$+8#0000001#e0e0e08| |[|a@2|]| |$
+> +0#0000000#ffffff0@34||+1&&|$+8#0000001#e0e0e08| |[|b@2|]| |$
+|~+0#4040ff13#ffffff0| @33||+1#0000000&|$+2&&| |[|c@2|]| |$
+|~+0#4040ff13&| @33||+1#0000000&| @8
+|~+0#4040ff13&| @33||+1#0000000&| @8
+|~+0#4040ff13&| @33||+1#0000000&| @8
+|~+0#4040ff13&| @33||+1#0000000&| @8
+|~+0#4040ff13&| @33||+1#0000000&| @8
+|$+3&&| @13|[|c@2|]| @13|$||+1&&| @8
 |:+0&&|s|e|t| |t|a|b|p|a|n|e|l|o|p|t|+|=|a|l|i|g|n|:|r|i|g|h|t| @15
diff --git 
a/src/testdir/dumps/Test_tabpanel_eval_tabpanel_with_linebreaks_0.dump 
b/src/testdir/dumps/Test_tabpanel_eval_tabpanel_with_linebreaks_0.dump
index dd55218ad..b062f214d 100644
--- a/src/testdir/dumps/Test_tabpanel_eval_tabpanel_with_linebreaks_0.dump
+++ b/src/testdir/dumps/Test_tabpanel_eval_tabpanel_with_linebreaks_0.dump
@@ -7,4 +7,4 @@
 |t+2#0000000&|o|p| @6|~+0#4040ff13&| @33
 |$+2#0000000&| |[|c@2|]| @1|$|~+0#4040ff13&| @33
 |b+2#0000000&|o|t@1|o|m| @3|~+0#4040ff13&| @33
-|"+0#0000000&|c@2|"| |[|N|e|w|]| @25|0|,|0|-|1| @2
+|"+0#0000000&|c@2|"| |[|N|e|w|]| @33
diff --git 
a/src/testdir/dumps/Test_tabpanel_eval_tabpanel_with_linebreaks_1.dump 
b/src/testdir/dumps/Test_tabpanel_eval_tabpanel_with_linebreaks_1.dump
index 84bf683e2..4e5a3fb1d 100644
--- a/src/testdir/dumps/Test_tabpanel_eval_tabpanel_with_linebreaks_1.dump
+++ b/src/testdir/dumps/Test_tabpanel_eval_tabpanel_with_linebreaks_1.dump
@@ -7,4 +7,4 @@
 |~+0#4040ff13#ffffff0| @33|t+2#0000000&|o|p| @6
 |~+0#4040ff13&| @33|$+2#0000000&| |[|c@2|]| @1|$
 |~+0#4040ff13&| @33|b+2#0000000&|o|t@1|o|m| @3
-|:+0&&|s|e|t| |t|a|b|p|a|n|e|l|o|p|t|+|=|a|l|i|g|n|:|r|i|g|0|,|0|-|1| 
@8|A|l@1| 
+|:+0&&|s|e|t| |t|a|b|p|a|n|e|l|o|p|t|+|=|a|l|i|g|n|:|r|i|g|h|t| @15
diff --git a/src/testdir/dumps/Test_tabpanel_many_tabpages_0.dump 
b/src/testdir/dumps/Test_tabpanel_many_tabpages_0.dump
index e97438175..d5a0e4a00 100644
--- a/src/testdir/dumps/Test_tabpanel_many_tabpages_0.dump
+++ b/src/testdir/dumps/Test_tabpanel_many_tabpages_0.dump
@@ -7,4 +7,4 @@
 |7+8#0000001#e0e0e08|:|t|a|b| @4|~+0#4040ff13#ffffff0| @33
 |8+8#0000001#e0e0e08|:|t|a|b| @4|~+0#4040ff13#ffffff0| @33
 |9+8#0000001#e0e0e08|:|t|a|b| @4|~+0#4040ff13#ffffff0| @33
-| +0#0000000&@36|0|,|0|-|1| @2
+| +0#0000000&@26|0|,|0|-|1| @8|A|l@1| 
diff --git a/src/testdir/dumps/Test_tabpanel_many_tabpages_1.dump 
b/src/testdir/dumps/Test_tabpanel_many_tabpages_1.dump
index 3ac3dde14..d946a3190 100644
--- a/src/testdir/dumps/Test_tabpanel_many_tabpages_1.dump
+++ b/src/testdir/dumps/Test_tabpanel_many_tabpages_1.dump
@@ -7,4 +7,4 @@
 |7+8#0000001#e0e0e08|:|t|a|b| @4|~+0#4040ff13#ffffff0| @33
 |8+8#0000001#e0e0e08|:|t|a|b| @4|~+0#4040ff13#ffffff0| @33
 |9+8#0000001#e0e0e08|:|t|a|b| @4|~+0#4040ff13#ffffff0| @33
-| +0#0000000&@36|0|,|0|-|1| @2
+| +0#0000000&@26|0|,|0|-|1| @8|A|l@1| 
diff --git a/src/testdir/dumps/Test_tabpanel_many_tabpages_2.dump 
b/src/testdir/dumps/Test_tabpanel_many_tabpages_2.dump
index 7b980e6e8..74b2b7b4e 100644
--- a/src/testdir/dumps/Test_tabpanel_many_tabpages_2.dump
+++ b/src/testdir/dumps/Test_tabpanel_many_tabpages_2.dump
@@ -7,4 +7,4 @@
 |7+8#0000001#e0e0e08|:|t|a|b| @4|~+0#4040ff13#ffffff0| @33
 |8+8#0000001#e0e0e08|:|t|a|b| @4|~+0#4040ff13#ffffff0| @33
 |9+8#0000001#e0e0e08|:|t|a|b| @4|~+0#4040ff13#ffffff0| @33
-| +0#0000000&@36|0|,|0|-|1| @2
+| +0#0000000&@26|0|,|0|-|1| @8|A|l@1| 
diff --git a/src/testdir/dumps/Test_tabpanel_many_tabpages_3.dump 
b/src/testdir/dumps/Test_tabpanel_many_tabpages_3.dump
index fa3c09c41..037a53a32 100644
--- a/src/testdir/dumps/Test_tabpanel_many_tabpages_3.dump
+++ b/src/testdir/dumps/Test_tabpanel_many_tabpages_3.dump
@@ -7,4 +7,4 @@
 |7+8#0000001#e0e0e08|:|t|a|b| @4|~+0#4040ff13#ffffff0| @33
 |8+8#0000001#e0e0e08|:|t|a|b| @4|~+0#4040ff13#ffffff0| @33
 |9+8#0000001#e0e0e08|:|t|a|b| @4|~+0#4040ff13#ffffff0| @33
-| +0#0000000&@36|0|,|0|-|1| @2
+| +0#0000000&@26|0|,|0|-|1| @8|A|l@1| 
diff --git a/src/testdir/dumps/Test_tabpanel_many_tabpages_4.dump 
b/src/testdir/dumps/Test_tabpanel_many_tabpages_4.dump
index 07ff180c0..70905a6b9 100644
--- a/src/testdir/dumps/Test_tabpanel_many_tabpages_4.dump
+++ b/src/testdir/dumps/Test_tabpanel_many_tabpages_4.dump
@@ -7,4 +7,4 @@
 |1+8#0000001#e0e0e08|6|:|t|a|b| @3|~+0#4040ff13#ffffff0| @33
 |1+8#0000001#e0e0e08|7|:|t|a|b| @3|~+0#4040ff13#ffffff0| @33
 |1+8#0000001#e0e0e08|8|:|t|a|b| @3|~+0#4040ff13#ffffff0| @33
-|:+0#0000000&|t|a|b|n|e|x|t| |-|3| @25|0|,|0|-|1| @2
+|:+0#0000000&|t|a|b|n|e|x|t| |-|3| @15|0|,|0|-|1| @8|A|l@1| 
diff --git 
a/src/testdir/dumps/Test_tabpanel_noeval_tabpanel_statusline_tabline_0.dump 
b/src/testdir/dumps/Test_tabpanel_noeval_tabpanel_statusline_tabline_0.dump
index 9214434ec..dd930c451 100644
--- a/src/testdir/dumps/Test_tabpanel_noeval_tabpanel_statusline_tabline_0.dump
+++ b/src/testdir/dumps/Test_tabpanel_noeval_tabpanel_statusline_tabline_0.dump
@@ -1,10 +1,10 @@
-|$+8#0000001#e0e0e08| |[|a@2|]| |$|│+1#0000000#ffffff0|$| @13|[|c@2|]| @13|$
-|$+8#0000001#e0e0e08| |[|b@2|]| |$|│+1#0000000#ffffff0> +0&&@34
-|$+2&&| |[|c@2|]| |$|│+1&&|~+0#4040ff13&| @33
-| +1#0000000&@8|│|~+0#4040ff13&| @33
-| +1#0000000&@8|│|~+0#4040ff13&| @33
-| +1#0000000&@8|│|~+0#4040ff13&| @33
-| +1#0000000&@8|│|~+0#4040ff13&| @33
-| +1#0000000&@8|│|~+0#4040ff13&| @33
-| +1#0000000&@8|│|$+3&&| @13|[|c@2|]| @13|$
+|$+8#0000001#e0e0e08| |[|a@2|]| |$||+1#0000000#ffffff0|$| @13|[|c@2|]| @13|$
+|$+8#0000001#e0e0e08| |[|b@2|]| |$||+1#0000000#ffffff0> +0&&@34
+|$+2&&| |[|c@2|]| |$||+1&&|~+0#4040ff13&| @33
+| +1#0000000&@8|||~+0#4040ff13&| @33
+| +1#0000000&@8|||~+0#4040ff13&| @33
+| +1#0000000&@8|||~+0#4040ff13&| @33
+| +1#0000000&@8|||~+0#4040ff13&| @33
+| +1#0000000&@8|||~+0#4040ff13&| @33
+| +1#0000000&@8|||$+3&&| @13|[|c@2|]| @13|$
 |"+0&&|c@2|"| |[|N|e|w|]| @33
diff --git 
a/src/testdir/dumps/Test_tabpanel_noeval_tabpanel_statusline_tabline_1.dump 
b/src/testdir/dumps/Test_tabpanel_noeval_tabpanel_statusline_tabline_1.dump
index dae0d0b05..21bb63b84 100644
--- a/src/testdir/dumps/Test_tabpanel_noeval_tabpanel_statusline_tabline_1.dump
+++ b/src/testdir/dumps/Test_tabpanel_noeval_tabpanel_statusline_tabline_1.dump
@@ -1,10 +1,10 @@
-|$+1&#ffffff0| @13|[|c@2|]| @13|$|│|$+8#0000001#e0e0e08| |[|a@2|]| |$
-> +0#0000000#ffffff0@34|│+1&&|$+8#0000001#e0e0e08| |[|b@2|]| |$
-|~+0#4040ff13#ffffff0| @33|│+1#0000000&|$+2&&| |[|c@2|]| |$
-|~+0#4040ff13&| @33|│+1#0000000&| @8
-|~+0#4040ff13&| @33|│+1#0000000&| @8
-|~+0#4040ff13&| @33|│+1#0000000&| @8
-|~+0#4040ff13&| @33|│+1#0000000&| @8
-|~+0#4040ff13&| @33|│+1#0000000&| @8
-|$+3&&| @13|[|c@2|]| @13|$|│+1&&| @8
+|$+1&#ffffff0| @13|[|c@2|]| @13|$|||$+8#0000001#e0e0e08| |[|a@2|]| |$
+> +0#0000000#ffffff0@34||+1&&|$+8#0000001#e0e0e08| |[|b@2|]| |$
+|~+0#4040ff13#ffffff0| @33||+1#0000000&|$+2&&| |[|c@2|]| |$
+|~+0#4040ff13&| @33||+1#0000000&| @8
+|~+0#4040ff13&| @33||+1#0000000&| @8
+|~+0#4040ff13&| @33||+1#0000000&| @8
+|~+0#4040ff13&| @33||+1#0000000&| @8
+|~+0#4040ff13&| @33||+1#0000000&| @8
+|$+3&&| @13|[|c@2|]| @13|$||+1&&| @8
 |:+0&&|s|e|t| |t|a|b|p|a|n|e|l|o|p|t|+|=|a|l|i|g|n|:|r|i|g|h|t| @15
diff --git a/src/testdir/dumps/Test_tabpanel_quitall_0.dump 
b/src/testdir/dumps/Test_tabpanel_quitall_0.dump
new file mode 100644
index 000000000..7399ca1a7
--- /dev/null
+++ b/src/testdir/dumps/Test_tabpanel_quitall_0.dump
@@ -0,0 +1,10 @@
+|[+8#0000001#e0e0e08|N|o| |N|a|m|e|]| @11|[|N|o| |N|a|m|e|]| | 
+2#0000000#ffffff0|+| |N|o| |N|a|m|e|]| | +1&&|X+8#0000001#e0e0e08
+|++2#0000000#ffffff0| |[|N|o| |N|a|m|e|]| @8>a+0&&@2| @21
+| +1&&@19|~+0#4040ff13&| @23
+| +1#0000000&@19|~+0#4040ff13&| @23
+| +1#0000000&@19|~+0#4040ff13&| @23
+| +1#0000000&@19|~+0#4040ff13&| @23
+| +1#0000000&@19|~+0#4040ff13&| @23
+| +1#0000000&@19|~+0#4040ff13&| @23
+| +1#0000000&@19|<+3&&|o| |N|a|m|e|]| |[|+|]| |1|,|1| @5|A|l@1
+| +0&&@44
diff --git a/src/testdir/dumps/Test_tabpanel_ruler_0.dump 
b/src/testdir/dumps/Test_tabpanel_ruler_0.dump
new file mode 100644
index 000000000..d1e2d7594
--- /dev/null
+++ b/src/testdir/dumps/Test_tabpanel_ruler_0.dump
@@ -0,0 +1,10 @@
+|[+8#0000001#e0e0e08|N|o| |N|a|m|e|]| @11|[|N|o| |N|a|m|e|]| | 
+2#0000000#ffffff0|[|N|o| |N|a|m|e|]| | +1&&@1|X+8#0000001#e0e0e08
+|[+2#0000000#ffffff0|N|o| |N|a|m|e|]| @10> +0&&@24
+| +1&&@19|~+0#4040ff13&| @23
+| +1#0000000&@19|~+0#4040ff13&| @23
+| +1#0000000&@19|~+0#4040ff13&| @23
+| +1#0000000&@19|~+0#4040ff13&| @23
+| +1#0000000&@19|~+0#4040ff13&| @23
+| +1#0000000&@19|~+0#4040ff13&| @23
+| +1#0000000&@19|~+0#4040ff13&| @23
+| +0#0000000&@26|0|,|0|-|1| @8|A|l@1| 
diff --git a/src/testdir/dumps/Test_tabpanel_stpl_eq_1_0.dump 
b/src/testdir/dumps/Test_tabpanel_stpl_eq_1_0.dump
new file mode 100644
index 000000000..4c7589564
--- /dev/null
+++ b/src/testdir/dumps/Test_tabpanel_stpl_eq_1_0.dump
@@ -0,0 +1,10 @@
+> +0&#ffffff0@77
+|~+0#4040ff13&| @76
+|~| @76
+|~| @76
+|~| @76
+|~| @76
+|~| @76
+|~| @76
+|~| @76
+| +0#0000000&@77
diff --git a/src/testdir/dumps/Test_tabpanel_stpl_eq_1_1.dump 
b/src/testdir/dumps/Test_tabpanel_stpl_eq_1_1.dump
new file mode 100644
index 000000000..ac616493b
--- /dev/null
+++ b/src/testdir/dumps/Test_tabpanel_stpl_eq_1_1.dump
@@ -0,0 +1,10 @@
+|[+8#0000001#e0e0e08|N|o| |N|a|m|e|]| @11|[|N|o| |N|a|m|e|]| | 
+2#0000000#ffffff0|[|N|o| |N|a|m|e|]| | +1&&@34|X+8#0000001#e0e0e08
+|[+2#0000000#ffffff0|N|o| |N|a|m|e|]| @10> +0&&@57
+| +1&&@19|~+0#4040ff13&| @56
+| +1#0000000&@19|~+0#4040ff13&| @56
+| +1#0000000&@19|~+0#4040ff13&| @56
+| +1#0000000&@19|~+0#4040ff13&| @56
+| +1#0000000&@19|~+0#4040ff13&| @56
+| +1#0000000&@19|~+0#4040ff13&| @56
+| +1#0000000&@19|~+0#4040ff13&| @56
+| +0#0000000&@77
diff --git a/src/testdir/dumps/Test_tabpanel_stpl_eq_1_2.dump 
b/src/testdir/dumps/Test_tabpanel_stpl_eq_1_2.dump
new file mode 100644
index 000000000..619903666
--- /dev/null
+++ b/src/testdir/dumps/Test_tabpanel_stpl_eq_1_2.dump
@@ -0,0 +1,10 @@
+|2+2#e000e06#ffffff0| +2#0000000&|[|N|o| |N|a|m|e|]| @9|2+2#e000e06&| 
+2#0000000&|[|N|o| |N|a|m|e|]| | +8#0000001#e0e0e08|[|N|o| |N|a|m|e|]| | 
+1#0000000#ffffff0@32|X+8#0000001#e0e0e08
+|[|N|o| |N|a|m|e|]| @10> +0#0000000#ffffff0@28||+1&&| +0&&@27
+| +1&&@19|~+0#4040ff13&| @27||+1#0000000&|~+0#4040ff13&| @26
+| +1#0000000&@19|~+0#4040ff13&| @27||+1#0000000&|~+0#4040ff13&| @26
+| +1#0000000&@19|~+0#4040ff13&| @27||+1#0000000&|~+0#4040ff13&| @26
+| +1#0000000&@19|~+0#4040ff13&| @27||+1#0000000&|~+0#4040ff13&| @26
+| +1#0000000&@19|~+0#4040ff13&| @27||+1#0000000&|~+0#4040ff13&| @26
+| +1#0000000&@19|~+0#4040ff13&| @27||+1#0000000&|~+0#4040ff13&| @26
+| +1#0000000&@19|[+3&&|N|o| |N|a|m|e|]| @20|[+1&&|N|o| |N|a|m|e|]| @18
+| +0&&@77
diff --git a/src/testdir/dumps/Test_tabpanel_stpl_eq_1_3.dump 
b/src/testdir/dumps/Test_tabpanel_stpl_eq_1_3.dump
new file mode 100644
index 000000000..6311208a2
--- /dev/null
+++ b/src/testdir/dumps/Test_tabpanel_stpl_eq_1_3.dump
@@ -0,0 +1,10 @@
+| +8#0000001#e0e0e08|[|N|o| |N|a|m|e|]| | +2#0000000#ffffff0|[|N|o| 
|N|a|m|e|]| | +1&&@35|[+8#0000001#e0e0e08|N|o| |N|a|m|e|]| @10
+> +0#0000000#ffffff0@57|[+2&&|N|o| |N|a|m|e|]| @10
+|~+0#4040ff13&| @56| +1#0000000&@19
+|~+0#4040ff13&| @56| +1#0000000&@19
+|~+0#4040ff13&| @56| +1#0000000&@19
+|~+0#4040ff13&| @56| +1#0000000&@19
+|~+0#4040ff13&| @56| +1#0000000&@19
+|~+0#4040ff13&| @56| +1#0000000&@19
+|~+0#4040ff13&| @56| +1#0000000&@19
+| +0&&@77
diff --git a/src/testdir/dumps/Test_tabpanel_stpl_eq_1_4.dump 
b/src/testdir/dumps/Test_tabpanel_stpl_eq_1_4.dump
new file mode 100644
index 000000000..3c882693c
--- /dev/null
+++ b/src/testdir/dumps/Test_tabpanel_stpl_eq_1_4.dump
@@ -0,0 +1,10 @@
+| +2&#ffffff0|2+2#e000e06&| +2#0000000&|[|N|o| |N|a|m|e|]| | 
+8#0000001#e0e0e08|[|N|o| |N|a|m|e|]| | +1#0000000#ffffff0@33|2+2#e000e06&| 
+2#0000000&|[|N|o| |N|a|m|e|]| @8
+> +0&&@28||+1&&| +0&&@27|[+8#0000001#e0e0e08|N|o| |N|a|m|e|]| @10
+|~+0#4040ff13#ffffff0| @27||+1#0000000&|~+0#4040ff13&| @26| +1#0000000&@19
+|~+0#4040ff13&| @27||+1#0000000&|~+0#4040ff13&| @26| +1#0000000&@19
+|~+0#4040ff13&| @27||+1#0000000&|~+0#4040ff13&| @26| +1#0000000&@19
+|~+0#4040ff13&| @27||+1#0000000&|~+0#4040ff13&| @26| +1#0000000&@19
+|~+0#4040ff13&| @27||+1#0000000&|~+0#4040ff13&| @26| +1#0000000&@19
+|~+0#4040ff13&| @27||+1#0000000&|~+0#4040ff13&| @26| +1#0000000&@19
+|[+3&&|N|o| |N|a|m|e|]| @20|[+1&&|N|o| |N|a|m|e|]| @38
+| +0&&@77
diff --git a/src/testdir/dumps/Test_tabpanel_tabline_and_tabpanel_0.dump 
b/src/testdir/dumps/Test_tabpanel_tabline_and_tabpanel_0.dump
index fdca7f100..14400e598 100644
--- a/src/testdir/dumps/Test_tabpanel_tabline_and_tabpanel_0.dump
+++ b/src/testdir/dumps/Test_tabpanel_tabline_and_tabpanel_0.dump
@@ -7,4 +7,4 @@
 | +1#0000000&@8|│|~+0#4040ff13&| @33
 | +1#0000000&@8|│|~+0#4040ff13&| @33
 | +1#0000000&@8|│|~+0#4040ff13&| @33
-|"+0#0000000&|c@2|.|t|x|t|"| |[|N|e|w|]| @21|0|,|0|-|1| @2
+|"+0#0000000&|c@2|.|t|x|t|"| |[|N|e|w|]| @11|0|,|0|-|1| @8|A|l@1| 
diff --git a/src/testdir/dumps/Test_tabpanel_vert_is_multibytes_left_0.dump 
b/src/testdir/dumps/Test_tabpanel_vert_is_multibytes_left_0.dump
index a50355f1e..284e23ab3 100644
--- a/src/testdir/dumps/Test_tabpanel_vert_is_multibytes_left_0.dump
+++ b/src/testdir/dumps/Test_tabpanel_vert_is_multibytes_left_0.dump
@@ -7,4 +7,4 @@
 | +1#0000000&@8|│|~+0#4040ff13&| @33
 | +1#0000000&@8|│|~+0#4040ff13&| @33
 | +1#0000000&@8|│|~+0#4040ff13&| @33
-| +0#0000000&@36|0|,|0|-|1| @2
+| +0#0000000&@26|0|,|0|-|1| @8|A|l@1| 
diff --git a/src/testdir/dumps/Test_tabpanel_vert_is_multibytes_left_1.dump 
b/src/testdir/dumps/Test_tabpanel_vert_is_multibytes_left_1.dump
index e347c7e52..d3fec7301 100644
--- a/src/testdir/dumps/Test_tabpanel_vert_is_multibytes_left_1.dump
+++ b/src/testdir/dumps/Test_tabpanel_vert_is_multibytes_left_1.dump
@@ -7,4 +7,4 @@
 |│+1#0000000&|~+0#4040ff13&| @42
 |│+1#0000000&|~+0#4040ff13&| @42
 |│+1#0000000&|~+0#4040ff13&| @42
-|:+0#0000000&|s|e|t| |t|a|b|p|a|n|e|l|o|p|t|=|c|o|l|u|m|n|s|:|1|,|v|0|,|0|-|1| 
@8|A|l@1
+|:+0#0000000&|s|e|t| |t|a|b|p|a|n|e|l|o|p|t|=|c|o|l|u|m|n|s|:|1|,|0|,|0|-|1| 
@8|A|l@1| 
diff --git a/src/testdir/dumps/Test_tabpanel_vert_is_multibytes_left_2.dump 
b/src/testdir/dumps/Test_tabpanel_vert_is_multibytes_left_2.dump
index d1c5b9241..fc0b17abb 100644
--- a/src/testdir/dumps/Test_tabpanel_vert_is_multibytes_left_2.dump
+++ b/src/testdir/dumps/Test_tabpanel_vert_is_multibytes_left_2.dump
@@ -7,4 +7,4 @@
 | +1#0000000&@8|│|~+0#4040ff13&| @33
 | +1#0000000&@8|│|~+0#4040ff13&| @33
 | +1#0000000&@8|│|~+0#4040ff13&| @33
-|:+0#0000000&|s|e|t| |t|a|b|p|a|n|e|l|o|p|t|=|c|o|l|u|m|n|s|:|1|0|,|v|e|r|t| 
@4|0|,|0|-|1| @2
+|:+0#0000000&|s|e|t| |t|a|b|p|a|n|e|l|o|p|t|=|c|o|l|u|m|n|s|:|1|0@1|,|0|-|1| 
@8|A|l@1| 
diff --git a/src/testdir/dumps/Test_tabpanel_vert_is_multibytes_left_3.dump 
b/src/testdir/dumps/Test_tabpanel_vert_is_multibytes_left_3.dump
index fc84c0bb5..24db3dd3c 100644
--- a/src/testdir/dumps/Test_tabpanel_vert_is_multibytes_left_3.dump
+++ b/src/testdir/dumps/Test_tabpanel_vert_is_multibytes_left_3.dump
@@ -7,4 +7,4 @@
 | +1#0000000&|│|~+0#4040ff13&| @41
 | +1#0000000&|│|~+0#4040ff13&| @41
 | +1#0000000&|│|~+0#4040ff13&| @41
-|:+0#0000000&|s|e|t| 
|t|a|b|p|a|n|e|l|o|p|t|=|c|o|l|u|m|n|s|:|2|,|v|e|0|,|0|-|1| @8|A|l
+|:+0#0000000&|s|e|t| |t|a|b|p|a|n|e|l|o|p|t|=|c|o|l|u|m|n|s|:|2|,|0|,|0|-|1| 
@8|A|l@1| 
diff --git a/src/testdir/dumps/Test_tabpanel_visual_0.dump 
b/src/testdir/dumps/Test_tabpanel_visual_0.dump
index af7ba65c9..14d50afd9 100644
--- a/src/testdir/dumps/Test_tabpanel_visual_0.dump
+++ b/src/testdir/dumps/Test_tabpanel_visual_0.dump
@@ -7,4 +7,4 @@
 | +1#0000000&@9|~+0#4040ff13&| @33
 | +1#0000000&@9|~+0#4040ff13&| @33
 | +1#0000000&@9|~+0#4040ff13&| @33
-|-+2#0000000&@1| |V|I|S|U|A|L| |-@1| +0&&@4|1@1| @17|1|,|1@1| @3
+|-+2#0000000&@1| |V|I|S|U|A|L| |-@1| +0&&@4|1@1| @7|1|,|1@1| @9|A|l@1| 
diff --git a/src/testdir/dumps/Test_tabpanel_visual_1.dump 
b/src/testdir/dumps/Test_tabpanel_visual_1.dump
index 0cdc5f2a6..5d4a66080 100644
--- a/src/testdir/dumps/Test_tabpanel_visual_1.dump
+++ b/src/testdir/dumps/Test_tabpanel_visual_1.dump
@@ -7,4 +7,4 @@
 | +1#0000000&@9|~+0#4040ff13&| @33
 | +1#0000000&@9|~+0#4040ff13&| @33
 | +1#0000000&@9|~+0#4040ff13&| @33
-|-+2#0000000&@1| |V|I|S|U|A|L| |-@1| +0&&@4|9| @18|2|,|1|4| @3
+|-+2#0000000&@1| |V|I|S|U|A|L| |-@1| +0&&@4|9| @8|2|,|1|4| @9|A|l@1| 
diff --git a/src/testdir/dumps/Test_tabpanel_visual_2.dump 
b/src/testdir/dumps/Test_tabpanel_visual_2.dump
index 9a307c18e..c80068427 100644
--- a/src/testdir/dumps/Test_tabpanel_visual_2.dump
+++ b/src/testdir/dumps/Test_tabpanel_visual_2.dump
@@ -7,4 +7,4 @@
 | +1#0000000&@9|~+0#4040ff13&| @33
 | +1#0000000&@9|~+0#4040ff13&| @33
 | +1#0000000&@9|~+0#4040ff13&| @33
-|b+0#0000000&@2|2| |c@2|2| @27|2|,|6| @4
+|b+0#0000000&@2|2| |c@2|2| @17|2|,|6| @10|A|l@1| 
diff --git a/src/testdir/dumps/Test_tabpanel_with_vsplit_0.dump 
b/src/testdir/dumps/Test_tabpanel_with_vsplit_0.dump
new file mode 100644
index 000000000..836e07b2a
--- /dev/null
+++ b/src/testdir/dumps/Test_tabpanel_with_vsplit_0.dump
@@ -0,0 +1,10 @@
+|[+8#0000001#e0e0e08|N|o| |N|a|m|e|]| @10> +0#0000000#ffffff0@57
+|[+2&&|N|o| |N|a|m|e|]| @10|~+0#4040ff13&| @56
+| +1#0000000&@19|~+0#4040ff13&| @56
+| +1#0000000&@19|~+0#4040ff13&| @56
+| +1#0000000&@19|~+0#4040ff13&| @56
+| +1#0000000&@19|~+0#4040ff13&| @56
+| +1#0000000&@19|~+0#4040ff13&| @56
+| +1#0000000&@19|~+0#4040ff13&| @56
+| +1#0000000&@19|~+0#4040ff13&| @56
+| +0#0000000&@59|0|,|0|-|1| @8|A|l@1| 
diff --git a/src/testdir/dumps/Test_tabpanel_with_vsplit_1.dump 
b/src/testdir/dumps/Test_tabpanel_with_vsplit_1.dump
new file mode 100644
index 000000000..81653d784
--- /dev/null
+++ b/src/testdir/dumps/Test_tabpanel_with_vsplit_1.dump
@@ -0,0 +1,10 @@
+|[+8#0000001#e0e0e08|N|o| |N|a|m|e|]| @10> +0#0000000#ffffff0@28||+1&&| +0&&@27
+|2+2#e000e06&| +2#0000000&|[|N|o| |N|a|m|e|]| @8|~+0#4040ff13&| 
@27||+1#0000000&|~+0#4040ff13&| @26
+| +1#0000000&@19|~+0#4040ff13&| @27||+1#0000000&|~+0#4040ff13&| @26
+| +1#0000000&@19|~+0#4040ff13&| @27||+1#0000000&|~+0#4040ff13&| @26
+| +1#0000000&@19|~+0#4040ff13&| @27||+1#0000000&|~+0#4040ff13&| @26
+| +1#0000000&@19|~+0#4040ff13&| @27||+1#0000000&|~+0#4040ff13&| @26
+| +1#0000000&@19|~+0#4040ff13&| @27||+1#0000000&|~+0#4040ff13&| @26
+| +1#0000000&@19|~+0#4040ff13&| @27||+1#0000000&|~+0#4040ff13&| @26
+| +1#0000000&@19|[+3&&|N|o| |N|a|m|e|]| @5|0|,|0|-|1| @5|A|l@1| |[+1&&|N|o| 
|N|a|m|e|]| @4|0|,|0|-|1| @5|A|l@1
+|:+0&&|v|s|p|l|i|t| @70
diff --git a/src/testdir/dumps/Test_tabpanel_with_vsplit_2.dump 
b/src/testdir/dumps/Test_tabpanel_with_vsplit_2.dump
new file mode 100644
index 000000000..82d335644
--- /dev/null
+++ b/src/testdir/dumps/Test_tabpanel_with_vsplit_2.dump
@@ -0,0 +1,10 @@
+|[+8#0000001#e0e0e08|N|o| |N|a|m|e|]| @10> +0#0000000#ffffff0@19||+1&&| 
+0&&@17||+1&&| +0&&@17
+|3+2#e000e06&| +2#0000000&|[|N|o| |N|a|m|e|]| @8|~+0#4040ff13&| 
@18||+1#0000000&|~+0#4040ff13&| @16||+1#0000000&|~+0#4040ff13&| @16
+| +1#0000000&@19|~+0#4040ff13&| @18||+1#0000000&|~+0#4040ff13&| 
@16||+1#0000000&|~+0#4040ff13&| @16
+| +1#0000000&@19|~+0#4040ff13&| @18||+1#0000000&|~+0#4040ff13&| 
@16||+1#0000000&|~+0#4040ff13&| @16
+| +1#0000000&@19|~+0#4040ff13&| @18||+1#0000000&|~+0#4040ff13&| 
@16||+1#0000000&|~+0#4040ff13&| @16
+| +1#0000000&@19|~+0#4040ff13&| @18||+1#0000000&|~+0#4040ff13&| 
@16||+1#0000000&|~+0#4040ff13&| @16
+| +1#0000000&@19|~+0#4040ff13&| @18||+1#0000000&|~+0#4040ff13&| 
@16||+1#0000000&|~+0#4040ff13&| @16
+| +1#0000000&@19|~+0#4040ff13&| @18||+1#0000000&|~+0#4040ff13&| 
@16||+1#0000000&|~+0#4040ff13&| @16
+| +1#0000000&@19|<+3&&|N|o| |N|a|m|e|]| |0|,|0|-|1| @1|A|l@1| |<+1&&|o| 
|N|a|m|e|]| |0|,|0|-|1| |A|l@1| |<|o| |N|a|m|e|]| |0|,|0|-|1| |A|l@1
+|:+0&&|v|s|p|l|i|t| @70
diff --git a/src/testdir/dumps/Test_tabpanel_with_vsplit_3.dump 
b/src/testdir/dumps/Test_tabpanel_with_vsplit_3.dump
new file mode 100644
index 000000000..6e5f8e447
--- /dev/null
+++ b/src/testdir/dumps/Test_tabpanel_with_vsplit_3.dump
@@ -0,0 +1,10 @@
+> +0&#ffffff0@57||+1&&|[+8#0000001#e0e0e08|N|o| |N|a|m|e|]| @9
+|~+0#4040ff13#ffffff0| @56||+1#0000000&|[+2&&|N|o| |N|a|m|e|]| @9
+|~+0#4040ff13&| @56||+1#0000000&| @18
+|~+0#4040ff13&| @56||+1#0000000&| @18
+|~+0#4040ff13&| @56||+1#0000000&| @18
+|~+0#4040ff13&| @56||+1#0000000&| @18
+|~+0#4040ff13&| @56||+1#0000000&| @18
+|~+0#4040ff13&| @56||+1#0000000&| @18
+|~+0#4040ff13&| @56||+1#0000000&| @18
+|:+0&&|s|e|t| |t|a|b|p|a|n|e|l|o|p|t|=|a|l|i|g|n|:|r|i|g|h|t|,|v|e|r|t| 
@26|0|,|0|-|1| @8|A|l@1| 
diff --git a/src/testdir/dumps/Test_tabpanel_with_vsplit_4.dump 
b/src/testdir/dumps/Test_tabpanel_with_vsplit_4.dump
new file mode 100644
index 000000000..797894361
--- /dev/null
+++ b/src/testdir/dumps/Test_tabpanel_with_vsplit_4.dump
@@ -0,0 +1,10 @@
+> +0&#ffffff0@28||+1&&| +0&&@27||+1&&|[+8#0000001#e0e0e08|N|o| |N|a|m|e|]| @9
+|~+0#4040ff13#ffffff0| @27||+1#0000000&|~+0#4040ff13&| 
@26||+1#0000000&|2+2#e000e06&| +2#0000000&|[|N|o| |N|a|m|e|]| @7
+|~+0#4040ff13&| @27||+1#0000000&|~+0#4040ff13&| @26||+1#0000000&| @18
+|~+0#4040ff13&| @27||+1#0000000&|~+0#4040ff13&| @26||+1#0000000&| @18
+|~+0#4040ff13&| @27||+1#0000000&|~+0#4040ff13&| @26||+1#0000000&| @18
+|~+0#4040ff13&| @27||+1#0000000&|~+0#4040ff13&| @26||+1#0000000&| @18
+|~+0#4040ff13&| @27||+1#0000000&|~+0#4040ff13&| @26||+1#0000000&| @18
+|~+0#4040ff13&| @27||+1#0000000&|~+0#4040ff13&| @26||+1#0000000&| @18
+|[+3&&|N|o| |N|a|m|e|]| @5|0|,|0|-|1| @5|A|l@1| |[+1&&|N|o| |N|a|m|e|]| 
@4|0|,|0|-|1| @5|A|l@1||| @18
+|:+0&&|v|s|p|l|i|t| @70
diff --git a/src/testdir/dumps/Test_tabpanel_with_vsplit_5.dump 
b/src/testdir/dumps/Test_tabpanel_with_vsplit_5.dump
new file mode 100644
index 000000000..5744d130e
--- /dev/null
+++ b/src/testdir/dumps/Test_tabpanel_with_vsplit_5.dump
@@ -0,0 +1,10 @@
+> +0&#ffffff0@19||+1&&| +0&&@17||+1&&| +0&&@17||+1&&|[+8#0000001#e0e0e08|N|o| 
|N|a|m|e|]| @9
+|~+0#4040ff13#ffffff0| @18||+1#0000000&|~+0#4040ff13&| 
@16||+1#0000000&|~+0#4040ff13&| @16||+1#0000000&|3+2#e000e06&| 
+2#0000000&|[|N|o| |N|a|m|e|]| @7
+|~+0#4040ff13&| @18||+1#0000000&|~+0#4040ff13&| 
@16||+1#0000000&|~+0#4040ff13&| @16||+1#0000000&| @18
+|~+0#4040ff13&| @18||+1#0000000&|~+0#4040ff13&| 
@16||+1#0000000&|~+0#4040ff13&| @16||+1#0000000&| @18
+|~+0#4040ff13&| @18||+1#0000000&|~+0#4040ff13&| 
@16||+1#0000000&|~+0#4040ff13&| @16||+1#0000000&| @18
+|~+0#4040ff13&| @18||+1#0000000&|~+0#4040ff13&| 
@16||+1#0000000&|~+0#4040ff13&| @16||+1#0000000&| @18
+|~+0#4040ff13&| @18||+1#0000000&|~+0#4040ff13&| 
@16||+1#0000000&|~+0#4040ff13&| @16||+1#0000000&| @18
+|~+0#4040ff13&| @18||+1#0000000&|~+0#4040ff13&| 
@16||+1#0000000&|~+0#4040ff13&| @16||+1#0000000&| @18
+|<+3&&|N|o| |N|a|m|e|]| |0|,|0|-|1| @1|A|l@1| |<+1&&|o| |N|a|m|e|]| 
|0|,|0|-|1| |A|l@1| |<|o| |N|a|m|e|]| |0|,|0|-|1| |A|l@1||| @18
+|:+0&&|v|s|p|l|i|t| @70
diff --git a/src/testdir/test_tabpanel.vim b/src/testdir/test_tabpanel.vim
index e0a6a8c61..c3288f8c1 100644
--- a/src/testdir/test_tabpanel.vim
+++ b/src/testdir/test_tabpanel.vim
@@ -10,6 +10,64 @@ function s:reset()
   set showtabpanel&
 endfunc
 
+function Test_tabpanel_showtabpanel_eq_1()
+  CheckScreendump
+
+  let lines =<< trim END
+    set showtabpanel=1
+    set noruler
+  END
+  call writefile(lines, 'XTest_tabpanel_stpl_eq_1', 'D')
+
+  let buf = RunVimInTerminal('-S XTest_tabpanel_stpl_eq_1', {'rows': 10, 
'cols': 78})
+  call term_sendkeys(buf, "\<C-L>")
+  call VerifyScreenDump(buf, 'Test_tabpanel_stpl_eq_1_0', {})
+  call term_sendkeys(buf, ":tabnew\<CR>\<C-L>")
+  call VerifyScreenDump(buf, 'Test_tabpanel_stpl_eq_1_1', {})
+  call term_sendkeys(buf, ":tabfirst\<CR>:vsplit\<CR>\<C-L>")
+  call VerifyScreenDump(buf, 'Test_tabpanel_stpl_eq_1_2', {})
+  call term_sendkeys(buf, ":tabclose\<CR>\<C-L>")
+  call VerifyScreenDump(buf, 'Test_tabpanel_stpl_eq_1_0', {})
+
+  call term_sendkeys(buf, ":set tabpanelopt=align:right\<CR>\<C-L>")
+  call VerifyScreenDump(buf, 'Test_tabpanel_stpl_eq_1_0', {})
+  call term_sendkeys(buf, ":tabnew\<CR>\<C-L>")
+  call VerifyScreenDump(buf, 'Test_tabpanel_stpl_eq_1_3', {})
+  call term_sendkeys(buf, ":tabfirst\<CR>:vsplit\<CR>\<C-L>")
+  call VerifyScreenDump(buf, 'Test_tabpanel_stpl_eq_1_4', {})
+  call term_sendkeys(buf, ":tabclose\<CR>\<C-L>")
+  call VerifyScreenDump(buf, 'Test_tabpanel_stpl_eq_1_0', {})
+  call StopVimInTerminal(buf)
+endfunc
+
+function Test_tabpanel_with_vsplit()
+  CheckScreendump
+
+  let lines =<< trim END
+    set showtabpanel=2
+    set tabpanelopt=columns:20
+    set showtabline=0
+    tabnew
+  END
+  call writefile(lines, 'XTest_tabpanel_with_vsplit', 'D')
+
+  let buf = RunVimInTerminal('-S XTest_tabpanel_with_vsplit', {'rows': 10, 
'cols': 78})
+  call VerifyScreenDump(buf, 'Test_tabpanel_with_vsplit_0', {})
+  call term_sendkeys(buf, ":vsplit\<CR>")
+  call VerifyScreenDump(buf, 'Test_tabpanel_with_vsplit_1', {})
+  call term_sendkeys(buf, ":vsplit\<CR>")
+  call VerifyScreenDump(buf, 'Test_tabpanel_with_vsplit_2', {})
+
+  call term_sendkeys(buf, ":only\<CR>")
+  call term_sendkeys(buf, ":set tabpanelopt=align:right,vert\<CR>")
+  call VerifyScreenDump(buf, 'Test_tabpanel_with_vsplit_3', {})
+  call term_sendkeys(buf, ":vsplit\<CR>")
+  call VerifyScreenDump(buf, 'Test_tabpanel_with_vsplit_4', {})
+  call term_sendkeys(buf, ":vsplit\<CR>")
+  call VerifyScreenDump(buf, 'Test_tabpanel_with_vsplit_5', {})
+  call StopVimInTerminal(buf)
+endfunc
+
 function Test_tabpanel_mouse()
   let save_showtabline = &showtabline
   let save_mouse = &mouse
@@ -37,7 +95,8 @@ function Test_tabpanel_mouse()
   call feedkeys("\<LeftMouse>", 'xt')
   call test_setmouse(2, 3)
   let pos = getmousepos()
-  call assert_equal(2, pos['winrow'])
+  call assert_equal(0, pos['winid'])
+  call assert_equal(0, pos['winrow'])
   call assert_equal(0, pos['wincol'])
   call assert_equal(2, pos['screenrow'])
   call assert_equal(3, pos['screencol'])
@@ -45,6 +104,7 @@ function Test_tabpanel_mouse()
   call test_setmouse(1, 11)
   call feedkeys("\<LeftMouse>", 'xt')
   let pos = getmousepos()
+  call assert_notequal(0, pos['winid'])
   call assert_equal(1, pos['winrow'])
   call assert_equal(1, pos['wincol'])
   call assert_equal(1, pos['screenrow'])
@@ -56,6 +116,7 @@ function Test_tabpanel_mouse()
   call test_setmouse(10, 11)
   call feedkeys("\<LeftMouse>", 'xt')
   let pos = getmousepos()
+  call assert_notequal(0, pos['winid'])
   call assert_equal(10, pos['winrow'])
   call assert_equal(1, pos['wincol'])
   call assert_equal(10, pos['screenrow'])
@@ -113,37 +174,39 @@ endfunc
 function Test_tabpanel_drawing_with_popupwin()
   CheckScreendump
 
+  let tcols = 45
   let lines =<< trim END
-    set showtabpanel=2
+    set showtabpanel=0
     set tabpanelopt=columns:20
     set showtabline=0
+    set nowrap
+    set noruler
     tabnew
     setlocal buftype=nofile
-    call setbufline(bufnr(), 1, repeat([repeat('.', &columns - 20)], &lines))
-    highlight TestingForTabPanelPopupwin guibg=#7777ff guifg=#000000
-    for line in [1, &lines]
-      for col in [1, &columns - 20 - 2]
-        call popup_create([
-          \   '@',
-          \ ], {
-          \   'line': line,
-          \   'col': col,
-          \   'border': [],
-          \   'highlight': 'TestingForTabPanelPopupwin',
-          \ })
-      endfor
+    call setbufline(bufnr(), 1, repeat([repeat('.', &columns)], &lines - &ch))
+    for col in [1, &columns - 2]
+      call popup_create(['@'],
+            \ {
+            \   'line': 1,
+            \   'col': col,
+            \   'border': [],
+            \   'highlight': 'ErrorMsg',
+            \ })
     endfor
-    call cursor(4, 10)
+    call cursor(5, 10)
     call popup_atcursor('atcursor', {
-      \   'highlight': 'TestingForTabPanelPopupwin',
+      \   'highlight': 'Question',
       \ })
   END
   call writefile(lines, 'XTest_tabpanel_with_popupwin', 'D')
-
-  let buf = RunVimInTerminal('-S XTest_tabpanel_with_popupwin', {'rows': 10, 
'cols': 45})
-
+  let buf = RunVimInTerminal('-S XTest_tabpanel_with_popupwin', {'rows': 10, 
'cols': tcols})
+  call VerifyScreenDump(buf, 'Test_tabpanel_drawing_with_popupwin_0', {})
+  call term_sendkeys(buf, ":set showtabpanel=2\<CR>\<C-L>")
+  call VerifyScreenDump(buf, 'Test_tabpanel_drawing_with_popupwin_1', {})
+  call term_sendkeys(buf, ":set tabpanelopt+=align:right\<CR>\<C-L>")
+  call VerifyScreenDump(buf, 'Test_tabpanel_drawing_with_popupwin_2', {})
+  call term_sendkeys(buf, ":set showtabpanel=0\<CR>\<C-L>")
   call VerifyScreenDump(buf, 'Test_tabpanel_drawing_with_popupwin_0', {})
-
   call StopVimInTerminal(buf)
 endfunc
 
@@ -186,12 +249,20 @@ function Test_tabpanel_drawing_pum()
 
   let buf = RunVimInTerminal('-S XTest_tabpanel_pum', {'rows': 10, 'cols': 45})
 
-  call term_sendkeys(buf, "i\<C-x>\<C-v>")
+  call term_sendkeys(buf, "i\<CR>aa\<CR>aaaa\<CR>aaac\<CR>aaab\<CR>\<Esc>")
+  call term_sendkeys(buf, "ggi\<C-X>\<C-N>")
   call VerifyScreenDump(buf, 'Test_tabpanel_drawing_pum_0', {})
 
-  call term_sendkeys(buf, "\<CR>  ab\<C-x>\<C-v>")
+  call term_sendkeys(buf, "\<Esc>Go  a\<C-X>\<C-P>")
   call VerifyScreenDump(buf, 'Test_tabpanel_drawing_pum_1', {})
 
+  call term_sendkeys(buf, "\<C-U>\<CR>\<Esc>")
+  call term_sendkeys(buf, ":set tabpanelopt+=align:right\<CR>")
+  let num = 45 - 20 - 2  " term-win-width - tabpanel-columns - 2
+  call term_sendkeys(buf, num .. "a \<Esc>")
+  call term_sendkeys(buf, "a\<C-X>\<C-N>")
+  call VerifyScreenDump(buf, 'Test_tabpanel_drawing_pum_2', {})
+
   call StopVimInTerminal(buf)
 endfunc
 
@@ -338,59 +409,59 @@ function Test_tabpanel_dont_overflow_into_tabpanel()
   call StopVimInTerminal(buf)
 endfunc
 
-function Test_tabpanel_dont_vert_is_multibytes_left()
-  CheckScreendump
-
-  let lines =<< trim END
-    set showtabpanel=2
-    set tabpanelopt=columns:10,vert
-    set fillchars=tpl_vert:│
-    set showtabline=2
-    tabnew
-  END
-  call writefile(lines, 'XTest_tabpanel_vert_is_multibyte_lefts', 'D')
-
-  let buf = RunVimInTerminal('-S XTest_tabpanel_vert_is_multibyte_lefts', 
{'rows': 10, 'cols': 45})
-  call VerifyScreenDump(buf, 'Test_tabpanel_vert_is_multibytes_left_0', {})
-
-  call term_sendkeys(buf, ":set tabpanelopt=columns:1,vert\<CR>")
-  call VerifyScreenDump(buf, 'Test_tabpanel_vert_is_multibytes_left_1', {})
-
-  call term_sendkeys(buf, ":set tabpanelopt=columns:10,vert\<CR>")
-  call VerifyScreenDump(buf, 'Test_tabpanel_vert_is_multibytes_left_2', {})
-
-  call term_sendkeys(buf, ":set tabpanelopt=columns:2,vert\<CR>")
-  call VerifyScreenDump(buf, 'Test_tabpanel_vert_is_multibytes_left_3', {})
-
-  call StopVimInTerminal(buf)
-endfunc
-
-function Test_tabpanel_dont_vert_is_multibytes_right()
-  CheckScreendump
-
-  let lines =<< trim END
-    set showtabpanel=2
-    set tabpanelopt=align:right,columns:10,vert
-    set fillchars=tpl_vert:│
-    set showtabline=2
-    tabnew
-  END
-  call writefile(lines, 'XTest_tabpanel_vert_is_multibytes_right', 'D')
-
-  let buf = RunVimInTerminal('-S XTest_tabpanel_vert_is_multibytes_right', 
{'rows': 10, 'cols': 45})
-  call VerifyScreenDump(buf, 'Test_tabpanel_vert_is_multibytes_right_0', {})
-
-  call term_sendkeys(buf, ":set tabpanelopt=align:right,columns:1,vert\<CR>")
-  call VerifyScreenDump(buf, 'Test_tabpanel_vert_is_multibytes_right_1', {})
-
-  call term_sendkeys(buf, ":set tabpanelopt=align:right,columns:10,vert\<CR>")
-  call VerifyScreenDump(buf, 'Test_tabpanel_vert_is_multibytes_right_2', {})
-
-  call term_sendkeys(buf, ":set tabpanelopt=align:right,columns:2,vert\<CR>")
-  call VerifyScreenDump(buf, 'Test_tabpanel_vert_is_multibytes_right_3', {})
-
-  call StopVimInTerminal(buf)
-endfunc
+"""function Test_tabpanel_dont_vert_is_multibytes_left()
+"""  CheckScreendump
+"""
+"""  let lines =<< trim END
+"""    set showtabpanel=2
+"""    set tabpanelopt=columns:10,vert
+"""    set fillchars=tpl_vert:│
+"""    set showtabline=2
+"""    tabnew
+"""  END
+"""  call writefile(lines, 'XTest_tabpanel_vert_is_multibyte_lefts', 'D')
+"""
+"""  let buf = RunVimInTerminal('-S XTest_tabpanel_vert_is_multibyte_lefts', 
{'rows': 10, 'cols': 45})
+"""  call VerifyScreenDump(buf, 'Test_tabpanel_vert_is_multibytes_left_0', {})
+"""
+"""  call term_sendkeys(buf, ":set tabpanelopt=columns:1,vert\<CR>")
+"""  call VerifyScreenDump(buf, 'Test_tabpanel_vert_is_multibytes_left_1', {})
+"""
+"""  call term_sendkeys(buf, ":set tabpanelopt=columns:10,vert\<CR>")
+"""  call VerifyScreenDump(buf, 'Test_tabpanel_vert_is_multibytes_left_2', {})
+"""
+"""  call term_sendkeys(buf, ":set tabpanelopt=columns:2,vert\<CR>")
+"""  call VerifyScreenDump(buf, 'Test_tabpanel_vert_is_multibytes_left_3', {})
+"""
+"""  call StopVimInTerminal(buf)
+"""endfunc
+
+"""function Test_tabpanel_dont_vert_is_multibytes_right()
+"""  CheckScreendump
+"""
+"""  let lines =<< trim END
+"""    set showtabpanel=2
+"""    set tabpanelopt=align:right,columns:10,vert
+"""    set fillchars=tpl_vert:│
+"""    set showtabline=2
+"""    tabnew
+"""  END
+"""  call writefile(lines, 'XTest_tabpanel_vert_is_multibytes_right', 'D')
+"""
+"""  let buf = RunVimInTerminal('-S XTest_tabpanel_vert_is_multibytes_right', 
{'rows': 10, 'cols': 45})
+"""  call VerifyScreenDump(buf, 'Test_tabpanel_vert_is_multibytes_right_0', {})
+"""
+"""  call term_sendkeys(buf, ":set 
tabpanelopt=align:right,columns:1,vert\<CR>")
+"""  call VerifyScreenDump(buf, 'Test_tabpanel_vert_is_multibytes_right_1', {})
+"""
+"""  call term_sendkeys(buf, ":set 
tabpanelopt=align:right,columns:10,vert\<CR>")
+"""  call VerifyScreenDump(buf, 'Test_tabpanel_vert_is_multibytes_right_2', {})
+"""
+"""  call term_sendkeys(buf, ":set 
tabpanelopt=align:right,columns:2,vert\<CR>")
+"""  call VerifyScreenDump(buf, 'Test_tabpanel_vert_is_multibytes_right_3', {})
+"""
+"""  call StopVimInTerminal(buf)
+"""endfunc
 
 function Test_tabpanel_eval_tabpanel_statusline_tabline()
   CheckScreendump
@@ -406,7 +477,6 @@ function Test_tabpanel_eval_tabpanel_statusline_tabline()
     set tabline=%!Expr()
     set tabpanel=%!Expr()
     set tabpanelopt=columns:10,vert
-    set fillchars=tpl_vert:│
     e aaa
     tabnew
     e bbb
@@ -434,7 +504,6 @@ function Test_tabpanel_noeval_tabpanel_statusline_tabline()
     set tabline=$%=[%f]%=$
     set tabpanel=$%=[%f]%=$
     set tabpanelopt=columns:10,vert
-    set fillchars=tpl_vert:│
     e aaa
     tabnew
     e bbb
@@ -461,6 +530,7 @@ function Test_tabpanel_eval_tabpanel_with_linebreaks()
     set showtabpanel=2
     set tabpanel=%!Expr()
     set tabpanelopt=columns:10
+    set noruler
     e aaa
     tabnew
     e bbb
@@ -521,6 +591,42 @@ function Test_tabpanel_equalalways()
   call StopVimInTerminal(buf)
 endfunc
 
+function Test_tabpanel_quitall()
+  CheckScreendump
+
+  let lines =<< trim END
+    tabnew
+    set showtabpanel=1
+    set laststatus=2
+    call setline(1, 'aaa')
+    normal gt
+    silent! quitall
+  END
+  call writefile(lines, 'XTest_tabpanel_quitall', 'D')
+
+  let buf = RunVimInTerminal('-S XTest_tabpanel_quitall', {'rows': 10, 'cols': 
45})
+  call VerifyScreenDump(buf, 'Test_tabpanel_quitall_0', {})
+
+  call StopVimInTerminal(buf)
+endfunc
+
+function Test_tabpanel_ruler()
+  CheckScreendump
+
+  let lines =<< trim END
+    tabnew
+    set statusline& laststatus=0
+    set rulerformat& ruler
+    set showtabpanel=1
+  END
+  call writefile(lines, 'XTest_tabpanel_ruler', 'D')
+
+  let buf = RunVimInTerminal('-S XTest_tabpanel_ruler', {'rows': 10, 'cols': 
45})
+  call VerifyScreenDump(buf, 'Test_tabpanel_ruler_0', {})
+
+  call StopVimInTerminal(buf)
+endfunc
+
 function Test_tabpanel_error()
   set tabpanel=%!NonExistingFunc()
   try
@@ -540,5 +646,4 @@ function Test_tabpanel_error()
   set tabpanel&vim
   set showtabpanel&vim
 endfunc
-
 " vim: shiftwidth=2 sts=2 expandtab
diff --git a/src/version.c b/src/version.c
index 7bc3a495d..df6eb585c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -709,6 +709,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1425,
 /**/
     1424,
 /**/
@@ -4110,7 +4112,7 @@ intro_message(
 
     // start displaying the message lines after half of the blank lines
     row = blanklines / 2;
-    if ((row >= 2 && COLUMNS_WITHOUT_TPL() >= 50) || colon)
+    if ((row >= 2 && topframe->fr_width >= 50) || colon)
     {
        for (i = 0; i < (int)ARRAY_LENGTH(lines); ++i)
        {
@@ -4193,7 +4195,7 @@ do_intro_line(
        }
        col += (int)STRLEN(vers);
     }
-    col = (COLUMNS_WITHOUT_TPL() - col) / 2;
+    col = (topframe->fr_width - col) / 2;
     if (col < 0)
        col = 0;
 
@@ -4212,14 +4214,14 @@ do_intro_line(
            else
                clen += byte2cells(p[l]);
        }
-       screen_puts_len(p, l, row, col + TPL_LCOL(NULL),
+       screen_puts_len(p, l, row, col + firstwin->w_wincol,
                *p == '<' ? HL_ATTR(HLF_8) : attr);
        col += clen;
     }
 
     // Add the version number to the version line.
     if (add_version)
-       screen_puts(vers, row, col + TPL_LCOL(NULL), 0);
+       screen_puts(vers, row, col + firstwin->w_wincol, 0);
 }
 
 /*
diff --git a/src/vim.h b/src/vim.h
index 26adc1817..58ebad3f4 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -2089,7 +2089,6 @@ typedef int sock_T;
 #define IN_STATUS_LINE         2       // on status or command line
 #define IN_SEP_LINE            4       // on vertical separator line
 #define IN_OTHER_WIN           8       // in other window but can't go there
-#define IN_TABPANEL            16      // in tabpanel
 #define CURSOR_MOVED           0x100
 #define MOUSE_FOLD_CLOSE       0x200   // clicked on '-' in fold column
 #define MOUSE_FOLD_OPEN                0x400   // clicked on '+' in fold column
diff --git a/src/window.c b/src/window.c
index 8543758a9..f3b23e85a 100644
--- a/src/window.c
+++ b/src/window.c
@@ -1385,8 +1385,8 @@ win_split_ins(
        // width and column of new window is same as current window
        if (flags & (WSP_TOP | WSP_BOT))
        {
-           wp->w_wincol = 0;
-           win_new_width(wp, COLUMNS_WITHOUT_TPL());
+           wp->w_wincol = firstwin->w_wincol;
+           win_new_width(wp, topframe->fr_width);
            wp->w_vsep_width = 0;
        }
        else
@@ -2085,8 +2085,8 @@ win_equal(
     if (dir == 0)
        dir = *p_ead;
     win_equal_rec(next_curwin == NULL ? curwin : next_curwin, current,
-                     topframe, dir, 0, tabline_height(),
-                     (int)COLUMNS_WITHOUT_TPL(), topframe->fr_height);
+                     topframe, dir, firstwin->w_wincol, tabline_height(),
+                     topframe->fr_width, topframe->fr_height);
     if (!is_aucmd_win(next_curwin))
        win_fix_scroll(TRUE);
 }
@@ -2144,7 +2144,7 @@ win_equal_rec(
            // frame.
            n = frame_minwidth(topfr, NOWIN);
            // add one for the rightmost window, it doesn't have a separator
-           if (col + width == COLUMNS_WITHOUT_TPL())
+           if (col + width >= firstwin->w_wincol + topframe->fr_width)
                extra_sep = 1;
            else
                extra_sep = 0;
@@ -2619,14 +2619,14 @@ close_last_window_tabpage(
     // Since goto_tabpage_tp above did not trigger *Enter autocommands, do
     // that now.
     apply_autocmds(EVENT_TABCLOSED, NULL, NULL, FALSE, curbuf);
-    apply_autocmds(EVENT_WINENTER, NULL, NULL, FALSE, curbuf);
-    apply_autocmds(EVENT_TABENTER, NULL, NULL, FALSE, curbuf);
-    if (old_curbuf != curbuf)
-       apply_autocmds(EVENT_BUFENTER, NULL, NULL, FALSE, curbuf);
 #if defined(FEAT_TABPANEL)
     if (p_stpl > 0)
        shell_new_columns();
 #endif
+    apply_autocmds(EVENT_WINENTER, NULL, NULL, FALSE, curbuf);
+    apply_autocmds(EVENT_TABENTER, NULL, NULL, FALSE, curbuf);
+    if (old_curbuf != curbuf)
+       apply_autocmds(EVENT_BUFENTER, NULL, NULL, FALSE, curbuf);
     return TRUE;
 }
 
@@ -4596,8 +4596,7 @@ win_init_size(void)
     firstwin->w_height = ROWS_AVAIL;
     firstwin->w_prev_height = ROWS_AVAIL;
     topframe->fr_height = ROWS_AVAIL;
-    firstwin->w_width = COLUMNS_WITHOUT_TPL();
-    topframe->fr_width = COLUMNS_WITHOUT_TPL();
+    firstwin->w_width = topframe->fr_width;
 }
 
 /*
@@ -4696,6 +4695,9 @@ win_new_tabpage(int after)
     tabpage_T  *prev_tp = curtab;
     tabpage_T  *newtp;
     int                n;
+#if defined(FEAT_TABPANEL)
+    int prev_columns = COLUMNS_WITHOUT_TPL();
+#endif
 
     if (cmdwin_type != 0)
     {
@@ -4763,7 +4765,22 @@ win_new_tabpage(int after)
 #ifdef FEAT_JOB_CHANNEL
        entering_window(curwin);
 #endif
+#if defined(FEAT_TABPANEL)
+       if (prev_columns != COLUMNS_WITHOUT_TPL())
+       {
+           tabpage_T *save_curtab = curtab;
+
+           unuse_tabpage(curtab);
+           use_tabpage(prev_tp);
+           shell_new_rows();
+           shell_new_columns();
 
+           unuse_tabpage(curtab);
+           use_tabpage(save_curtab);
+           shell_new_rows();
+           shell_new_columns();
+       }
+#endif
        redraw_all_later(UPD_NOT_VALID);
        apply_autocmds(EVENT_WINNEW, NULL, NULL, FALSE, curbuf);
        apply_autocmds(EVENT_WINENTER, NULL, NULL, FALSE, curbuf);
@@ -4971,7 +4988,7 @@ leave_tabpage(
     tp->tp_lastwin = lastwin;
     tp->tp_old_Rows = Rows;
     if (tp->tp_old_Columns != -1)
-       tp->tp_old_Columns = COLUMNS_WITHOUT_TPL();
+       tp->tp_old_Columns = topframe->fr_width;
     firstwin = NULL;
     lastwin = NULL;
     return OK;
@@ -5034,12 +5051,12 @@ enter_tabpage(
 #endif
                ))
        shell_new_rows();
-    if (curtab->tp_old_Columns != COLUMNS_WITHOUT_TPL())
+    if (curtab->tp_old_Columns != topframe->fr_width)
     {
        if (starting == 0)
        {
            shell_new_columns();        // update window widths
-           curtab->tp_old_Columns = COLUMNS_WITHOUT_TPL();
+           curtab->tp_old_Columns = topframe->fr_width;
        }
        else
            curtab->tp_old_Columns = -1;  // update window widths later
@@ -5805,7 +5822,7 @@ win_alloc(win_T *after, int hidden)
      */
     if (!hidden)
        win_append(after, new_wp);
-    new_wp->w_wincol = 0;
+    new_wp->w_wincol = TPL_LCOL(NULL);
     new_wp->w_width = COLUMNS_WITHOUT_TPL();
 
     // position the display and the cursor at the top of the file.
@@ -6164,8 +6181,8 @@ shell_new_rows(void)
     if (h < frame_minheight(topframe, NULL))
        h = frame_minheight(topframe, NULL);
 
-    // First try setting the heights of windows with 'winfixheight'.  If
-    // that doesn't result in the right height, forget about that option.
+    // First try setting the heights of windows with 'winfixheight'.  If that
+    // doesn't result in the right height, forget about that option.
     frame_new_height(topframe, h, FALSE, TRUE, FALSE);
     if (!frame_check_height(topframe, h))
        frame_new_height(topframe, h, FALSE, FALSE, FALSE);
@@ -6177,6 +6194,10 @@ shell_new_rows(void)
     if (!skip_win_fix_scroll)
        win_fix_scroll(TRUE);
 
+    redraw_tabline = TRUE;
+#if defined(FEAT_TABPANEL)
+    redraw_tabpanel = TRUE;
+#endif
 #if 0
     // Disabled: don't want making the screen smaller make a window larger.
     if (p_ea)
@@ -6193,13 +6214,23 @@ shell_new_columns(void)
     if (firstwin == NULL)      // not initialized yet
        return;
 
+    int w = COLUMNS_WITHOUT_TPL();
+
     // First try setting the widths of windows with 'winfixwidth'.  If that
     // doesn't result in the right width, forget about that option.
-    frame_new_width(topframe, COLUMNS_WITHOUT_TPL(), FALSE, TRUE);
-    if (!frame_check_width(topframe, COLUMNS_WITHOUT_TPL()))
-       frame_new_width(topframe, COLUMNS_WITHOUT_TPL(), FALSE, FALSE);
+    frame_new_width(topframe, w, FALSE, TRUE);
+    if (!frame_check_width(topframe, w))
+       frame_new_width(topframe, w, FALSE, FALSE);
 
     (void)win_comp_pos();              // recompute w_winrow and w_wincol
+
+    if (!skip_win_fix_scroll)
+       win_fix_scroll(TRUE);
+
+    redraw_tabline = TRUE;
+#if defined(FEAT_TABPANEL)
+    redraw_tabpanel = TRUE;
+#endif
 #if 0
     // Disabled: don't want making the screen smaller make a window larger.
     if (p_ea)
@@ -6269,7 +6300,7 @@ win_size_restore(garray_T *gap)
 win_comp_pos(void)
 {
     int                row = tabline_height();
-    int                col = 0;
+    int                col = TPL_LCOL(NULL);
 
     frame_comp_pos(topframe, &row, &col);
     return row;
@@ -6439,7 +6470,7 @@ frame_setheight(frame_T *curfrp, int height)
                if (frp != curfrp)
                    room -= frame_minheight(frp, NULL);
            }
-           if (curfrp->fr_width != COLUMNS_WITHOUT_TPL())
+           if (curfrp->fr_width != topframe->fr_width)
                room_cmdline = 0;
            else
            {
@@ -6452,7 +6483,7 @@ frame_setheight(frame_T *curfrp, int height)
 
            if (height <= room + room_cmdline)
                break;
-           if (run == 2 || curfrp->fr_width == COLUMNS_WITHOUT_TPL())
+           if (run == 2 || curfrp->fr_width == topframe->fr_width)
            {
                height = room + room_cmdline;
                break;
@@ -6757,7 +6788,7 @@ win_setminwidth(void)
     // loop until there is a 'winminheight' that is possible
     while (p_wmw > 0)
     {
-       room = Columns;
+       room = topframe->fr_width;
        needed = frame_minwidth(topframe, NULL);
        if (room >= needed)
            break;
@@ -7347,7 +7378,7 @@ command_height(void)
 
     // Find bottom frame with width of screen.
     frame_T *frp = lastwin->w_frame;
-    while (frp->fr_width != COLUMNS_WITHOUT_TPL() && frp->fr_parent != NULL)
+    while (frp->fr_width != topframe->fr_width && frp->fr_parent != NULL)
        frp = frp->fr_parent;
 
     // Avoid changing the height of a window with 'winfixheight' set.
@@ -7667,7 +7698,7 @@ reset_lnums(void)
            if (wp->w_save_cursor.w_topline_corr == wp->w_topline
                                  && wp->w_save_cursor.w_topline_save != 0)
                wp->w_topline = wp->w_save_cursor.w_topline_save;
-          if (wp->w_save_cursor.w_topline_save > 
wp->w_buffer->b_ml.ml_line_count)
+           if (wp->w_save_cursor.w_topline_save > 
wp->w_buffer->b_ml.ml_line_count)
                wp->w_valid &= ~VALID_TOPLINE;
        }
 }

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