Commit CanvasItem state only if it changed

(cherry picked from commit 036f6a3fa8e35ba94c4f3f3e714d79ee2d10f2cc)

editor/plugins/canvas_item_editor_plugin.cpp

@@ -932,8 +932,23 @@ void CanvasItemEditor::_restore_canvas_item_state(List<CanvasItem *> p_canvas_it
 }
 
 void CanvasItemEditor::_commit_canvas_item_state(List<CanvasItem *> p_canvas_items, String action_name, bool commit_bones) {
-	undo_redo->create_action(action_name);
+	List<CanvasItem *> modified_canvas_items;
 	for (List<CanvasItem *>::Element *E = p_canvas_items.front(); E; E = E->next()) {
+		CanvasItem *canvas_item = E->get();
+		Dictionary old_state = editor_selection->get_node_editor_data<CanvasItemEditorSelectedItem>(canvas_item)->undo_state;
+		Dictionary new_state = canvas_item->_edit_get_state();
+
+		if (old_state.hash() != new_state.hash()) {
+			modified_canvas_items.push_back(canvas_item);
+		}
+	}
+
+	if (modified_canvas_items.empty()) {
+		return;
+	}
+
+	undo_redo->create_action(action_name);
+	for (List<CanvasItem *>::Element *E = modified_canvas_items.front(); E; E = E->next()) {
 		CanvasItem *canvas_item = E->get();
 		CanvasItemEditorSelectedItem *se = editor_selection->get_node_editor_data<CanvasItemEditorSelectedItem>(canvas_item);
 		undo_redo->add_do_method(canvas_item, "_edit_set_state", canvas_item->_edit_get_state());