Patch 9.0.0455
Problem:    A few problems with 'splitscroll'.
Solution:   Fix 'splitscroll' problems. (Luuk van Baal, closes #11117)
Files:      src/main.c, src/menu.c, src/window.c,
            src/testdir/test_window_cmd.vim


*** ../vim-9.0.0454/src/main.c  2022-09-06 18:31:09.070310282 +0100
--- src/main.c  2022-09-13 11:49:16.670776270 +0100
***************
*** 375,381 ****
       * Set the default values for the options that use Rows and Columns.
       */
      ui_get_shellsize();               // inits Rows and Columns
-     win_init_size();
  #ifdef FEAT_DIFF
      // Set the 'diff' option now, so that it can be checked for in a .vimrc
      // file.  There is no buffer yet though.
--- 375,380 ----
***************
*** 542,547 ****
--- 541,547 ----
            mch_exit(1);
      }
  #endif
+     win_init_size();
  
  #ifdef FEAT_VIMINFO
      /*
*** ../vim-9.0.0454/src/menu.c  2022-09-12 13:35:06.514946763 +0100
--- src/menu.c  2022-09-13 11:49:16.670776270 +0100
***************
*** 436,441 ****
--- 436,442 ----
                --curwin->w_height;
            curwin->w_winbar_height = h;
        }
+       curwin->w_prev_height = curwin->w_height;
      }
  
  theend:
*** ../vim-9.0.0454/src/window.c        2022-09-11 16:59:48.938110035 +0100
--- src/window.c        2022-09-13 11:49:16.674776259 +0100
***************
*** 3923,3928 ****
--- 3923,3929 ----
  win_init_size(void)
  {
      firstwin->w_height = ROWS_AVAIL;
+     firstwin->w_prev_height = ROWS_AVAIL;
      topframe->fr_height = ROWS_AVAIL;
      firstwin->w_width = Columns;
      topframe->fr_width = Columns;
***************
*** 4069,4074 ****
--- 4070,4076 ----
  
        win_init_size();
        firstwin->w_winrow = tabline_height();
+       firstwin->w_prev_winrow = firstwin->w_winrow;
        win_comp_scroll(curwin);
  
        newtp->tp_topframe = topframe;
***************
*** 6372,6381 ****
            {
                lnum = wp->w_cursor.lnum;
                wp->w_cursor.lnum = MIN(wp->w_buffer->b_ml.ml_line_count,
!                       wp->w_botline - 1 + (wp->w_prev_height
!                           ? (wp->w_winrow - wp->w_prev_winrow)
!                                          + (wp->w_height - wp->w_prev_height)
!                           : -WINBAR_HEIGHT(wp)));
                // Bring the new cursor position to the bottom of the screen.
                wp->w_fraction = FRACTION_MULT;
                scroll_to_fraction(wp, wp->w_prev_height);
--- 6374,6381 ----
            {
                lnum = wp->w_cursor.lnum;
                wp->w_cursor.lnum = MIN(wp->w_buffer->b_ml.ml_line_count,
!                       wp->w_botline - 1 + (wp->w_winrow - wp->w_prev_winrow)
!                                         + (wp->w_height - wp->w_prev_height));
                // Bring the new cursor position to the bottom of the screen.
                wp->w_fraction = FRACTION_MULT;
                scroll_to_fraction(wp, wp->w_prev_height);
***************
*** 6802,6807 ****
--- 6802,6810 ----
            comp_col();
            redraw_all_later(UPD_SOME_VALID);
        }
+       // Set prev_height when difference is due to 'laststatus'.
+       if (abs(wp->w_height - wp->w_prev_height) == 1)
+           wp->w_prev_height = wp->w_height;
      }
      else if (fr->fr_layout == FR_ROW)
      {
***************
*** 7091,7096 ****
--- 7094,7101 ----
        win_comp_pos();
        if (wp != NULL && close_curwin)
            win_goto(wp);
+       if (!p_spsc)
+           win_fix_scroll(FALSE);
        redraw_all_later(UPD_NOT_VALID);
      }
      clear_snapshot(curtab, idx);
*** ../vim-9.0.0454/src/testdir/test_window_cmd.vim     2022-09-11 
16:59:48.938110035 +0100
--- src/testdir/test_window_cmd.vim     2022-09-13 11:49:16.670776270 +0100
***************
*** 1646,1651 ****
--- 1646,1652 ----
            for so in [0, 5]
              for ls in range(0, 2)
                for pos in ["H", "M", "L"]
+               tabnew | tabonly! | redraw
                let tabline = (gui ? 0 : (tab ? 1 : 0))
                let winbar_sb = (sb ? winbar : 0)
                execute 'set scrolloff=' . so
***************
*** 1655,1671 ****
                execute tab ? 'tabnew' : ''
                execute winbar ? 'nnoremenu 1.10 WinBar.Test :echo' : ''
                call setline(1, range(1, 256))
!               execute 'norm gg' . pos
!               " No scroll for vertical split and quit
!               vsplit | quit
!               call assert_equal(1, line("w0"))
  
!               " No scroll for horizontal split
!               split | redraw! | wincmd k
                call assert_equal(1, line("w0"))
  
                " No scroll when resizing windows
!               resize +2
                call assert_equal(1, line("w0"))
                wincmd j
                call assert_equal(win_screenpos(0)[0] - tabline - winbar_sb, 
line("w0"))
--- 1656,1678 ----
                execute tab ? 'tabnew' : ''
                execute winbar ? 'nnoremenu 1.10 WinBar.Test :echo' : ''
                call setline(1, range(1, 256))
!               " No scroll for restore_snapshot
!               norm G
!               try
!                 copen | close | colder
!               catch /E380/
!               endtry
!               call assert_equal(257 - winheight(0), line("w0"))
  
!               " No scroll for firstwin horizontal split
!               execute 'norm gg' . pos
!               split | redraw | wincmd k
                call assert_equal(1, line("w0"))
+               wincmd j
+               call assert_equal(win_screenpos(0)[0] - tabline - winbar_sb, 
line("w0"))
  
                " No scroll when resizing windows
!               wincmd k | resize +2
                call assert_equal(1, line("w0"))
                wincmd j
                call assert_equal(win_screenpos(0)[0] - tabline - winbar_sb, 
line("w0"))
***************
*** 1715,1721 ****
                call assert_equal(1, line("w0"))
  
                " No scroll in windows split and quit multiple times
!               quit | split | split | quit
                call assert_equal(win_screenpos(0)[0] - tabline - winbar_sb, 
line("w0"))
  
                " No scroll for new buffer
--- 1722,1728 ----
                call assert_equal(1, line("w0"))
  
                " No scroll in windows split and quit multiple times
!               quit | redraw | split | redraw | split | redraw | quit | redraw
                call assert_equal(win_screenpos(0)[0] - tabline - winbar_sb, 
line("w0"))
  
                " No scroll for new buffer
***************
*** 1740,1750 ****
                call assert_equal(6, line("w0"))
                wincmd j
                call assert_equal(5 + win_screenpos(0)[0] - tabline - 
winbar_sb, line("w0"))
-               only
                endfor
              endfor
            endfor
-           tabonly!
          endfor
        endfor
      endfor
--- 1747,1755 ----
*** ../vim-9.0.0454/src/version.c       2022-09-13 11:25:50.510322375 +0100
--- src/version.c       2022-09-13 11:50:40.170553294 +0100
***************
*** 705,706 ****
--- 705,708 ----
  {   /* Add new patch number below this line */
+ /**/
+     455,
  /**/

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