Ticket #41023: 41023.patch

wp-includes/vars.php

@@ -139 +139 @@
                 $is_mobile = false;
         }
 
-        return $is_mobile;
+        /**
+         * Filters weather the request should be treated as mobile or not.
+         *
+         * @since 4.8.1
+         *
+         * @param bool $is_mobile Whether the request is from a mobile device or not.
+         */
+        return apply_filters( 'wp_is_mobile', $is_mobile );
 }