vim-patch:8.0.0962

closes #6726

Problem:    Crash with virtualedit and joining lines.
            (Joshua T Corbin, Neovim #6726)
Solution:   When using a mark check that coladd is valid.

9aa1569128

src/nvim/cursor.c

@@ -375,17 +375,27 @@ void check_cursor_col_win(win_T *win)
     win->w_cursor.col = 0;
   }
 
-  /* If virtual editing is on, we can leave the cursor on the old position,
+  // If virtual editing is on, we can leave the cursor on the old position,
-   * only we must set it to virtual.  But don't do it when at the end of the
+  // only we must set it to virtual.  But don't do it when at the end of the
-   * line. */
+  // line.
-  if (oldcol == MAXCOL)
+  if (oldcol == MAXCOL) {
     win->w_cursor.coladd = 0;
-  else if (ve_flags == VE_ALL) {
+  } else if (ve_flags == VE_ALL) {
-    if (oldcoladd > win->w_cursor.col)
+    if (oldcoladd > win->w_cursor.col) {
       win->w_cursor.coladd = oldcoladd - win->w_cursor.col;
-    else
+      if (win->w_cursor.col < len && win->w_cursor.coladd > 0) {
-      /* avoid weird number when there is a miscalculation or overflow */
+        int cs, ce;
+
+        // check that coladd is not more than the char width
+        getvcol(win, &win->w_cursor, &cs, NULL, &ce);
+        if (win->w_cursor.coladd > ce - cs) {
+          win->w_cursor.coladd = ce - cs;
+        }
+      }
+    } else {
+      // avoid weird number when there is a miscalculation or overflow
       win->w_cursor.coladd = 0;
+    }
   }
 }
 

src/nvim/normal.c

@@ -1548,8 +1548,10 @@ void do_pending_operator(cmdarg_T *cap, int old_col, bool gui_yank)
       }
 
       oap->start = VIsual;
-      if (VIsual_mode == 'V')
+      if (VIsual_mode == 'V') {
         oap->start.col = 0;
+        oap->start.coladd = 0;
+      }
     }
 
     /*
@@ -6260,15 +6262,18 @@ static void nv_gomark(cmdarg_T *cap)
   } else
     nv_cursormark(cap, cap->arg, pos);
 
-  /* May need to clear the coladd that a mark includes. */
+  // May need to clear the coladd that a mark includes.
-  if (!virtual_active())
+  if (!virtual_active()) {
     curwin->w_cursor.coladd = 0;
+  }
+  check_cursor_col();
   if (cap->oap->op_type == OP_NOP
       && pos != NULL
       && (pos == (pos_T *)-1 || !equalpos(old_cursor, *pos))
       && (fdo_flags & FDO_MARK)
-      && old_KeyTyped)
+      && old_KeyTyped) {
     foldOpenCursor();
+  }
 }
 
 /*

src/nvim/testdir/test_alot.vim

@@ -34,4 +34,5 @@ source test_taglist.vim
 source test_true_false.vim
 source test_unlet.vim
 source test_utf8.vim
+source test_virtualedit.vim
 source test_window_cmd.vim

src/nvim/testdir/test_virtualedit.vim

@@ -0,0 +1,31 @@
+" Tests for 'virtualedit'.
+
+func Test_yank_move_change()
+  split
+  call setline(1, [
+	\ "func foo() error {",
+	\ "\tif n, err := bar();",
+	\ "\terr != nil {",
+	\ "\t\treturn err",
+	\ "\t}",
+	\ "\tn = n * n",
+	\ ])
+  set virtualedit=all
+  set ts=4
+  function! MoveSelectionDown(count) abort
+    normal! m`
+    silent! exe "'<,'>move'>+".a:count
+    norm! ``
+  endfunction
+
+  xmap ]e :<C-U>call MoveSelectionDown(v:count1)<CR>
+  2
+  normal 2gg
+  normal J
+  normal jVj
+  normal ]e
+  normal ce
+  bwipe!
+  set virtualedit=
+  set ts=8
+endfunc