master 20f7a022f81: Avoid errors in winner.el's 'post-command-hook'

[Eli Zaretskii]

branch: master
commit 20f7a022f817eaed5f6889d9a892c22fc46f0d2f
Author: Eli Zaretskii <eliz@gnu.org>
Commit: Eli Zaretskii <eliz@gnu.org>

    Avoid errors in winner.el's 'post-command-hook'
    
    * lisp/winner.el (winner-save-old-configurations): Don't save
    configuration of dead frames.  (Bug#68977)
---
 lisp/winner.el | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lisp/winner.el b/lisp/winner.el
index 2aa59a86b25..19641a05bfc 100644
--- a/lisp/winner.el
+++ b/lisp/winner.el
@@ -178,7 +178,8 @@ You may want to include buffer names such as *Help*, 
*Apropos*,
       (setq winner-last-frames nil)
       (setq winner-last-command this-command))
     (dolist (frame winner-modified-list)
-      (winner-insert-if-new frame))
+      (if (frame-live-p frame)
+          (winner-insert-if-new frame)))
     (setq winner-modified-list nil)
     (winner-remember)))