Fix re-using an image id for an animated image for a still image causing a crash

Fixes #6244

docs/changelog.rst

@@ -52,6 +52,8 @@ Detailed list of changes
 
 - diff kitten: Fix a regression in 0.28.0 that broke using relative paths as arguments to the kitten (:iss:`6325`)
 
+- Fix re-using an image id for an animated image for a still image causing a crash (:iss:`6244`)
+
 0.28.1 [2023-04-21]
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 

kitty/graphics.c

@@ -561,6 +561,7 @@ handle_add_command(GraphicsManager *self, const GraphicsCommand *g, const uint8_
             img->root_frame_data_loaded = false;
             img->is_drawn = false;
             img->current_frame_shown_at = 0;
+            img->extra_framecnt = 0;
             free_image(self, img);
             *is_dirty = true;
             self->layers_dirty = true;