Ticket #27826: 27826.diff

src/wp-includes/css/buttons.css

@@ -276 +276 @@
         border-radius: 0 3px 3px 0;
 }
 
+.wp-core-ui .button-group > .button:focus {
+        position: relative;
+        z-index: 1;
+}
+
 /* ----------------------------------------------------------------------------
   5.0 - Responsive Button Styles
 ---------------------------------------------------------------------------- */