Filecache should check &useskin. This should be backported.

diff --git a/includes/Article.php b/includes/Article.php
index 21ec092..639e449 100644 (file)
--- a/includes/Article.php
+++ b/includes/Article.php
@@ -2932,6 +2932,7 @@ class Article {
                $redirect  = $wgRequest->getVal( 'redirect'  );
                $printable = $wgRequest->getVal( 'printable' );
                $page      = $wgRequest->getVal( 'page' );
+               $useskin   = $wgRequest->getVal( 'useskin' );
 
                //check for non-standard user language; this covers uselang,
                //and extensions for auto-detecting user language.
@@ -2944,6 +2945,7 @@ class Article {
                        && ($wgUser->isAnon())
                        && (!$wgUser->getNewtalk())
                        && ($this->mTitle->getNamespace() != NS_SPECIAL )
+                       && (!isset($useskin))
                        && (empty( $action ) || $action == 'view')
                        && (!isset($oldid))
                        && (!isset($diff))