Avoid segfaults due to image cache being cleared during redisplay

* src/xdisp.c (redisplay_internal): Set the
inhibit_clear_image_cache flag of a frame while its windows
are being redisplayed, and reset the flag after the call top
update_frame returns.
* src/image.c (clear_image_cache): Do nothing if the frame's
inhibit_clear_image_cache flag is set.  (Bug#34256)
* src/frame.h (struct frame): New flag inhibit_clear_image_cache.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/image.c b/src/image.c
index 57bbf3cdb93..642bf671520 100644
--- a/src/image.c
+++ b/src/image.c
@@ -1554,7 +1554,7 @@ clear_image_cache (struct frame *f, Lisp_Object filter)
 {
   struct image_cache *c = FRAME_IMAGE_CACHE (f);
 
-  if (c)
+  if (c && !f->inhibit_clear_image_cache)
     {
       ptrdiff_t i, nfreed = 0;