Patch 8.2.0835
Problem:    Motif: mapping <C-bslash> still doesn't work.
Solution:   Accept CSI for K_SPECIAL.  Do not apply CTRL to the character
            early.  (closes #6150)
Files:      src/getchar.c, src/gui_x11.c


*** ../vim-8.2.0834/src/getchar.c       2020-05-03 22:57:26.973427368 +0200
--- src/getchar.c       2020-05-28 20:44:25.091199970 +0200
***************
*** 2279,2284 ****
--- 2279,2293 ----
                    || ((compl_cont_status & CONT_LOCAL)
                        && (tb_c1 == Ctrl_N || tb_c1 == Ctrl_P))))
      {
+ #ifdef FEAT_GUI
+       if (gui.in_use && tb_c1 == CSI && typebuf.tb_len >= 2
+               && typebuf.tb_buf[typebuf.tb_off + 1] == KS_MODIFIER)
+       {
+           // The GUI code sends CSI KS_MODIFIER {flags}, but mappings expect
+           // K_SPECIAL KS_MODIFIER {flags}.
+           tb_c1 = K_SPECIAL;
+       }
+ #endif
  #ifdef FEAT_LANGMAP
        if (tb_c1 == K_SPECIAL)
            nolmaplen = 2;
***************
*** 2337,2343 ****
                    if (mp->m_keys[mlen] != c2)
  #else
                    if (mp->m_keys[mlen] !=
!                       typebuf.tb_buf[typebuf.tb_off + mlen])
  #endif
                        break;
                }
--- 2346,2352 ----
                    if (mp->m_keys[mlen] != c2)
  #else
                    if (mp->m_keys[mlen] !=
!                                        typebuf.tb_buf[typebuf.tb_off + mlen])
  #endif
                        break;
                }
*** ../vim-8.2.0834/src/gui_x11.c       2020-05-26 22:14:23.089012942 +0200
--- src/gui_x11.c       2020-05-28 20:57:26.346246038 +0200
***************
*** 920,926 ****
--- 920,931 ----
      if (ev_press->state & ShiftMask)
        modifiers |= MOD_MASK_SHIFT;
      if (ev_press->state & ControlMask)
+     {
        modifiers |= MOD_MASK_CTRL;
+       if (len == 1 && string[0] < 0x20)
+           // Use the character before applyng CTRL.
+           string[0] += 0x40;
+     }
      if (ev_press->state & Mod1Mask)
        modifiers |= MOD_MASK_ALT;
      if (ev_press->state & Mod4Mask)
*** ../vim-8.2.0834/src/version.c       2020-05-27 23:15:12.846004351 +0200
--- src/version.c       2020-05-28 20:59:01.446042693 +0200
***************
*** 748,749 ****
--- 748,751 ----
  {   /* Add new patch number below this line */
+ /**/
+     835,
  /**/

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