Ticket #26630: 26630.6.patch

src/wp-admin/menu-header.php

@@ -77 +77 @@
 
                 $class = $class ? ' class="' . join( ' ', $class ) . '"' : '';
                 $id = ! empty( $item[5] ) ? ' id="' . preg_replace( '|[^a-zA-Z0-9_:.]|', '-', $item[5] ) . '"' : '';
-                $img = $img_style = $img_class = '';
+                $img = $img_style = '';
+                $img_class = ' dashicons-before';
 
                 // if the string 'none' (previously 'div') is passed instead of an URL, don't output the default menu image
                 // so an icon can be added to div.wp-menu-image as background with CSS.