Index: src/wp-includes/js/tinymce/plugins/wordpress/plugin.js
===================================================================
--- src/wp-includes/js/tinymce/plugins/wordpress/plugin.js	(revision 37457)
+++ src/wp-includes/js/tinymce/plugins/wordpress/plugin.js	(working copy)
@@ -902,7 +902,10 @@
 				if ( activeToolbar.tempHide || event.type === 'hide' ) {
 					activeToolbar.hide();
 					activeToolbar = false;
-				} else if ( ( event.type === 'resize' || event.type === 'scroll' ) && ! activeToolbar.blockHide ) {
+				} else if (
+					tinymce.inArray( event.type, [ 'scroll', 'scrollwindow', 'resize', 'resizewindow' ] ) &&
+					! activeToolbar.blockHide
+				) {
 					clearTimeout( timeout );
 
 					timeout = setTimeout( function() {