Prevent hoverIntent from shifting open, expanded admin menus if the entire submenu is not visible. props SergeyBiryukov, fixes #20857.

git-svn-id: https://develop.svn.wordpress.org/trunk@21065 602fd350-edb4-49c9-b593-d223f7449a82

wp-admin/js/common.dev.js

@@ -189,6 +189,9 @@ $(document).ready( function() {
 		over: function(e){
 			var b, h, o, f, m = $(this).find('.wp-submenu'), menutop, wintop, maxtop;
 
+			if ( m.is(':visible') )
+				return;
+
 			menutop = $(this).offset().top;
 			wintop = $(window).scrollTop();
 			maxtop = menutop - wintop - 30; // max = make the top of the sub almost touch admin bar