Ticket #28267: 28267.2.patch

src/wp-admin/css/common.css

@@ -260 +260 @@
                 0 0 2px 1px rgba(30, 140, 190, .8);
 }
 
+a:active {
+    box-shadow: none;
+}
+
 .ie8 a:focus {
         outline: #5b9dd9 solid 1px;
 }