-Fixes to undo redo to avoid crash, closes #24251

-Changed Animation to have a special signal when tracks are changed, to avoid unnecesary track cache rebuilds in AnimationPlayer
-Added missing emit_changed whe modifying keys to Animation
-Changed AnimationPlayer to use the new refcounted connections instead of the previous hacky way to keep references
-Changed AnimationEditor to update the current track when keys are edited
-Fixed bug where undo/redo did not work with AnimationKeyEdit (was not being updated)
-Made sure UndoRedo does not mind deleted objects in undo/redo history, this would corrupt the history or clear it without need.

1 files changed, 2 insertions, 0 deletions

diff --git a/scene/scene_string_names.h b/scene/scene_string_names.h
index 4d1a7f255c..bc75165b8c 100644
--- a/scene/scene_string_names.h
+++ b/scene/scene_string_names.h
@@ -205,6 +205,8 @@ public:
 
 	StringName parameters_base_path;
 
+	StringName tracks_changed;
+
 	enum {
 		MAX_MATERIALS = 32
 	};