Ticket #37313: 37313.diff

src/wp-admin/js/editor-expand.js

@@ -277 +277 @@
                         }
                 } );
 
+                function debouncedScrollHandler() {
+                        return _.debounce( function( event ) {
+                                adjust( event.type );
+                        }, 100 );
+                }
+
                 // Adjust the toolbars based on the active editor mode.
                 function adjust( event ) {
                         // Make sure we're not in fullscreen mode.
@@ -582 +588 @@
                         }
                 }
 
-                function afterScroll() {
-                        clearTimeout( scrollTimer );
-                        scrollTimer = setTimeout( adjust, 100 );
-                }
-
                 function on() {
                         // Scroll to the top when triggering this from JS.
                         // Ensures toolbars are pinned properly.
@@ -597 +598 @@
                         $wrap.addClass( 'wp-editor-expand' );
 
                         // Adjust when the window is scrolled or resized.
-                        $window.on( 'scroll.editor-expand resize.editor-expand', function( event ) {
-                                adjust( event.type );
-                                afterScroll();
-                        } );
+                        $window.on( 'scroll.editor-expand resize.editor-expand', debouncedScrollHandler() );
 
                         // Adjust when collapsing the menu, changing the columns, changing the body class.
                         $document.on( 'wp-collapse-menu.editor-expand postboxes-columnchange.editor-expand editor-classchange.editor-expand', adjust )