Ticket #26649: 26649.patch

wp-includes/shortcodes.php

@@ -262 +262 @@
 
         // allow [[foo]] syntax for escaping a tag
         if ( $m[1] == '[' && $m[6] == ']' ) {
-                return substr($m[0], 1, -1);
+                return '['.substr($m[0], 2, -1);
         }
 
         $tag = $m[2];
@@ -379 +379 @@
 function strip_shortcode_tag( $m ) {
         // allow [[foo]] syntax for escaping a tag
         if ( $m[1] == '[' && $m[6] == ']' ) {
-                return substr($m[0], 1, -1);
+                return '['.substr($m[0], 2, -1);
         }
 
         return $m[1] . $m[6];