Ticket #39351: menu.patch

wp-admin/menu.php

@@ -102 +102 @@
                 // Special handling for data:image/svg+xml and Dashicons.
                 if ( 0 === strpos( $ptype_obj->menu_icon, 'data:image/svg+xml;base64,' ) || 0 === strpos( $ptype_obj->menu_icon, 'dashicons-' ) ) {
                         $menu_icon = $ptype_obj->menu_icon;
+                // No modification of menu_icon values of custom post types containing 'none' or 'div'
+                // This is documented in class WP_Post_Type for $menu_icon
+                } elseif( 'none' == $ptype_obj->menu_icon || 'div' == $ptype_obj->menu_icon ) {
+                        $menu_icon = $ptype_obj->menu_icon;
                 } else {
                         $menu_icon = esc_url( $ptype_obj->menu_icon );
                 }