From 98520b17eed08bdc5c0dc746ec91499503b81990 Mon Sep 17 00:00:00 2001
From: Daniel Kinzler <daniel@users.mediawiki.org>
Date: Sun, 17 Aug 2008 21:08:58 +0000
Subject: [PATCH] add new option $wgRestrictDisplayTitle

---
 RELEASE-NOTES                           |  4 +++-
 includes/DefaultSettings.php            |  5 +++++
 includes/parser/CoreParserFunctions.php | 10 ++++++++--
 3 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/RELEASE-NOTES b/RELEASE-NOTES
index d67e7de864..1b73c1991b 100644
--- a/RELEASE-NOTES
+++ b/RELEASE-NOTES
@@ -19,7 +19,9 @@ Those wishing to use the latest code instead of a branch release can obtain
 it from source control: http://www.mediawiki.org/wiki/Download_from_SVN
 
 === Configuration changes in 1.14 ===
-
+* $wgRestrictDisplayTitle controls if the use of the {{DISPLAYTITLE}} magic
+  word is restricted to titles equivalent to the actual page title. This
+  is true per default, but can be set to false to allow any title.
 * $wgExemptFromUserRobotsControl is an array of namespaces to be exempt from
   the effect of the new __INDEX__/__NOINDEX__ magic words.  (Default: null, ex-
   empt all content namespaces.)
diff --git a/includes/DefaultSettings.php b/includes/DefaultSettings.php
index be75dc1cec..692e1ff802 100644
--- a/includes/DefaultSettings.php
+++ b/includes/DefaultSettings.php
@@ -3156,6 +3156,11 @@ $wgAjaxLicensePreview = true;
  */
 $wgAllowDisplayTitle = true;
 
+/**
+ * for consistency, restrict DISPLAYTITLE to titles that normalize to the same canonical DB key 
+ */
+$wgRestrictDisplayTitle = true;
+
 /**
  * Array of usernames which may not be registered or logged in from
  * Maintenance scripts can still use these
diff --git a/includes/parser/CoreParserFunctions.php b/includes/parser/CoreParserFunctions.php
index 8ae1e0a07b..14c75d07be 100644
--- a/includes/parser/CoreParserFunctions.php
+++ b/includes/parser/CoreParserFunctions.php
@@ -170,10 +170,16 @@ class CoreParserFunctions {
 	 * @return string
 	 */
 	static function displaytitle( $parser, $text = '' ) {
+		global $wgRestrictDisplayTitle;
 		$text = trim( Sanitizer::decodeCharReferences( $text ) );
-		$title = Title::newFromText( $text );
-		if( $title instanceof Title && $title->getFragment() == '' && $title->equals( $parser->mTitle ) )
+
+		if ( !$wgRestrictDisplayTitle ) {
 			$parser->mOutput->setDisplayTitle( $text );
+		} else {
+			$title = Title::newFromText( $text );
+			if( $title instanceof Title && $title->getFragment() == '' && $title->equals( $parser->mTitle ) )
+				$parser->mOutput->setDisplayTitle( $text );
+		}
 		return '';
 	}
 
-- 
2.20.1