Menu: Ignore mouseenter events while typeahead is actice

Prevents focusing the wrong item when typeahead causes a scroll while the mouse
is over an item in the menu.

Fixes #10458

ui/menu.js

@@ -101,6 +101,12 @@ return $.widget( "ui.menu", {
				}
			},
			"mouseenter .ui-menu-item": function( event ) {
				// Ignore mouse events while typeahead is active, see #10458.
				// Prevents focusing the wrong item when typeahead causes a scroll while the mouse
				// is over an item in the menu
				if ( this.previousFilter ) {
					return;
				}
				var target = $( event.currentTarget );
				// Remove ui-state-active class from siblings of the newly focused menu item
				// to avoid a jump caused by adjacent elements both having a class with a border