Ticket #42114: 42114.2.diff

src/wp-admin/js/customize-controls.js

@@ -786 +786 @@
                         canceled = true;
                 }
 
-                // Remove animation class in case it was already applied.
-                button.removeClass( animationClass );
-
                 params.focusTarget.on( 'focusin', cancelReminder );
                 setTimeout( function() {
                         params.focusTarget.off( 'focusin', cancelReminder );
 
                         if ( ! canceled ) {
                                 button.addClass( animationClass );
+                                button.one( 'animationend', function () {
+                                        /*
+                                        * Remove animation class to avoid situations in Customizer where
+                                        * DOM nodes are moved (re-inserted) and the animation repeats.
+                                        */
+                                        button.removeClass( animationClass );
+                                } );
                         }
                 }, params.delay );