sidebar pluginlist - clear float for vext row with more than 3 sidebars

templates/2k11/admin/style.css

@@ -3058,6 +3058,10 @@ img.mfp-img {
         margin-left: 1%;
     }
 
+    #pluginlist_sidebar .pluginmanager_side:nth-of-type(4) {
+        clear: left;
+    }
+
     #meta p {
         font-size: .875em;
         padding: .85715em;