HtmlVariableList support html on keys (php-debugbar#539)

Author: parallels999

src/DebugBar/Resources/widgets.js

@@ -263,7 +263,7 @@ if (typeof(PhpDebugBar) == 'undefined') {
         className: csscls('kvlist htmlvarlist'),
 
         itemRenderer: function(dt, dd, key, value) {
-            $('<span />').attr('title', key).text(key).appendTo(dt);
+            $('<span />').attr('title', $('<i />').html(key || '').text()).html(key || '').appendTo(dt);
             dd.html(value);
         }