patch 8.0.0948: crash if timer closes window while dragging status linev8.0.0948

Problem:    Crash if timer closes window while dragging status line.
Solution:   Check if the window still exists. (Yasuhiro Matsumoto, closes
            #1979)

1 files changed, 3 insertions, 1 deletions

diff --git a/src/gui.c b/src/gui.c
index 63625bfc40..f774750f2b 100644
--- a/src/gui.c
+++ b/src/gui.c
@@ -4933,7 +4933,7 @@ gui_mouse_correct(void)
 }
 
 /*
- * Find window where the mouse pointer "y" coordinate is in.
+ * Find window where the mouse pointer "x" / "y" coordinate is in.
  */
     static win_T *
 xy2win(int x UNUSED, int y UNUSED)
@@ -4948,6 +4948,8 @@ xy2win(int x UNUSED, int y UNUSED)
     if (row < 0 || col < 0)		/* before first window */
 	return NULL;
     wp = mouse_find_win(&row, &col);
+    if (wp == NULL)
+	return NULL;
 # ifdef FEAT_MOUSESHAPE
     if (State == HITRETURN || State == ASKMORE)
     {