menubar: fix pixel-shifting visual error

Author: Steven G. Harms

ui/jquery.ui.menubar.js

@@ -103,6 +103,7 @@ $.widget( "ui.menubar", {
 			var $item = $menuItem.children("button, a");
 
 			menubar._determineSubmenuStatus( $menuItem, menubar );
+			menubar._styleMenuItem( $menuItem, menubar );
 			if ( $menuItem.data("hasSubMenu") ) {
 				menubar._initializeSubMenu( $menuItem, menubar );
 			}
@@ -118,6 +119,13 @@ $.widget( "ui.menubar", {
 		$menuItem.data( "hasSubMenu", hasSubMenu );
 	},
 
+	_styleMenuItem: function( $menuItem, menubar ) {
+		$menuItem.css({
+			"border-width" : "1px",
+			"border-style" : "hidden"
+		});
+	},
+
 	_initializeSubMenu: function( $menuItem, menubar ){
 		var subMenus = $menuItem.children( menubar.options.menuElement );