vim-patch:9.1.0186: cursor pos wrong on mouse click after eol with 'rl', 've' and conceal (#27903)

Problem:  Wrong cursor position when clicking after end of line with
          'rightleft', 'virtualedit' and conceal.
Solution: Set values in ScreenCols[] also with SLF_RIGHTLEFT.  Also fix
          off-by-one cursor position with 'colorcolumn' (zeertzjq).

closes: vim/vim#14218

deb2204bff

src/nvim/drawline.c

@@ -2621,12 +2621,11 @@ int win_line(win_T *wp, linenr_T lnum, int startrow, int endrow, int col_rows, s
           // linebuf_vcol[] already filled by the for loop above
           wlv.off++;
           wlv.col++;
+          wlv.vcol++;
 
-          if (vcol_hlc(wlv) >= rightmost_vcol) {
+          if (vcol_hlc(wlv) > rightmost_vcol) {
             break;
           }
-
-          wlv.vcol++;
         }
       }
 

src/nvim/grid.c

@@ -750,10 +750,15 @@ void grid_put_linebuf(ScreenGrid *grid, int row, int coloff, int col, int endcol
   }
 
   int clear_dirty_start = -1, clear_end = -1;
+  if (flags & SLF_RIGHTLEFT) {
+    for (col = clear_width - 1; col >= clear_start; col--) {
+      size_t off = off_to + (size_t)col;
+      grid->vcols[off] = (flags & SLF_INC_VCOL) ? ++last_vcol : last_vcol;
+    }
+  }
   // blank out the rest of the line
   // TODO(bfredl): we could cache winline widths
-  col = clear_start;
-  while (col < clear_width) {
+  for (col = clear_start; col < clear_width; col++) {
     size_t off = off_to + (size_t)col;
     if (grid->chars[off] != schar_from_ascii(' ')
         || grid->attrs[off] != bg_attr
@@ -765,8 +770,9 @@ void grid_put_linebuf(ScreenGrid *grid, int row, int coloff, int col, int endcol
       }
       clear_end = col + 1;
     }
-    grid->vcols[off] = (flags & SLF_INC_VCOL) ? ++last_vcol : last_vcol;
-    col++;
+    if (!(flags & SLF_RIGHTLEFT)) {
+      grid->vcols[off] = (flags & SLF_INC_VCOL) ? ++last_vcol : last_vcol;
+    }
   }
 
   if ((flags & SLF_RIGHTLEFT) && start_dirty != -1 && clear_dirty_start != -1) {

src/nvim/grid_defs.h

@@ -37,7 +37,7 @@ enum {
 /// attrs[] contains the highlighting attribute for each cell.
 ///
 /// vcols[] contains the virtual columns in the line. -1 means not available
-/// or before buffer text, MAXCOL means after the end of the line.
+/// or before buffer text.
 /// -2 or -3 means in fold column and a mouse click should:
 ///  -2: open a fold
 ///  -3: close a fold

test/old/testdir/test_conceal.vim

@@ -462,6 +462,53 @@ func Test_conceal_mouse_click()
     call Ntest_setmouse(1, 32)
     call feedkeys("\<LeftMouse>", "tx")
     call assert_equal([0, 1, 24, 12, 36], getcurpos())
+    " Behavior should also be the same with 'colorcolumn'.
+    setlocal colorcolumn=30
+    redraw
+    call Ntest_setmouse(1, 31)
+    call feedkeys("\<LeftMouse>", "tx")
+    call assert_equal([0, 1, 24, 11, 35], getcurpos())
+    call Ntest_setmouse(1, 32)
+    call feedkeys("\<LeftMouse>", "tx")
+    call assert_equal([0, 1, 24, 12, 36], getcurpos())
+    setlocal colorcolumn&
+
+    if has('rightleft')
+      setlocal rightleft
+      call assert_equal([
+            \ '                     ereh kcilc  laecnoc',
+            \ ], ScreenLines(1, 40))
+      " Click on the space between "this" and "click" puts cursor there.
+      call Ntest_setmouse(1, 41 - 9)
+      call feedkeys("\<LeftMouse>", "tx")
+      call assert_equal([0, 1, 13, 0, 13], getcurpos())
+      " Click on 'h' of "here" puts cursor there.
+      call Ntest_setmouse(1, 41 - 16)
+      call feedkeys("\<LeftMouse>", "tx")
+      call assert_equal([0, 1, 20, 0, 20], getcurpos())
+      " Click on 'e' of "here" puts cursor there.
+      call Ntest_setmouse(1, 41 - 19)
+      call feedkeys("\<LeftMouse>", "tx")
+      call assert_equal([0, 1, 23, 0, 23], getcurpos())
+      " Click after end of line puts cursor there with 'virtualedit'.
+      call Ntest_setmouse(1, 41 - 20)
+      call feedkeys("\<LeftMouse>", "tx")
+      call assert_equal([0, 1, 24, 0, 24], getcurpos())
+      call Ntest_setmouse(1, 41 - 21)
+      call feedkeys("\<LeftMouse>", "tx")
+      call assert_equal([0, 1, 24, 1, 25], getcurpos())
+      call Ntest_setmouse(1, 41 - 22)
+      call feedkeys("\<LeftMouse>", "tx")
+      call assert_equal([0, 1, 24, 2, 26], getcurpos())
+      call Ntest_setmouse(1, 41 - 31)
+      call feedkeys("\<LeftMouse>", "tx")
+      call assert_equal([0, 1, 24, 11, 35], getcurpos())
+      call Ntest_setmouse(1, 41 - 32)
+      call feedkeys("\<LeftMouse>", "tx")
+      call assert_equal([0, 1, 24, 12, 36], getcurpos())
+      setlocal rightleft&
+    endif
+
     set virtualedit&
 
     " Test with a wrapped line.