Increase the z-index of widgets so they don't appear behind menu port…

…ions while dragging. props jkudish. fixes #20300

git-svn-id: http://core.svn.wordpress.org/trunk@21214 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/js/widgets.dev.js

@@ -77,7 +77,7 @@ wpWidgets = {
 			handle: '> .widget-top > .widget-title',
 			distance: 2,
 			helper: 'clone',
-			zIndex: 5,
+			zIndex: 100,
 			containment: 'document',
 			start: function(e,ui) {
 				ui.helper.find('div.widget-description').hide();