From f3f82e3f60c8b72af70b5be287dee758d04962dd Mon Sep 17 00:00:00 2001
From: Brion Vibber <brion@users.mediawiki.org>
Date: Thu, 13 Mar 2008 18:30:50 +0000
Subject: [PATCH] * (bug 10721) Duplicate section anchors with differing case
 now disambiguated   for Internet Explorer's sake

---
 RELEASE-NOTES               |  3 +++
 includes/Parser.php         |  9 +++++++--
 maintenance/parserTests.txt | 11 +++++++++++
 3 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/RELEASE-NOTES b/RELEASE-NOTES
index 8100b84fc1..c2888ad7a3 100644
--- a/RELEASE-NOTES
+++ b/RELEASE-NOTES
@@ -81,6 +81,9 @@ it from source control: http://www.mediawiki.org/wiki/Download_from_SVN
   case-insensitive names.
 * Adding the fix for lists in RTL wikis to more skins, and fixing the image toc
 * (bug 8157) Remove redirects from Special:Unusedtemplates. Patch by WebBoy.
+* (bug 10721) Duplicate section anchors with differing case now disambiguated
+  for Internet Explorer's sake
+
 
 === API changes in 1.13 ===
 
diff --git a/includes/Parser.php b/includes/Parser.php
index acefb8dcaa..ef4e2a1ed9 100644
--- a/includes/Parser.php
+++ b/includes/Parser.php
@@ -3494,11 +3494,16 @@ class Parser
 			# Save headline for section edit hint before it's escaped
 			$headlineHint = $safeHeadline;
 			$safeHeadline = Sanitizer::escapeId( $safeHeadline );
+			# lowercase headline, since some browser don't distinguish
+			# "Anchor" from "anchor" (bug #10721)
+			$arrayKey = strtolower( $safeHeadline );
+
+			# XXX : Is $refers[$headlineCount] ever accessed, actually ?
 			$refers[$headlineCount] = $safeHeadline;
 
 			# count how many in assoc. array so we can track dupes in anchors
-			isset( $refers[$safeHeadline] ) ? $refers[$safeHeadline]++ : $refers[$safeHeadline] = 1;
-			$refcount[$headlineCount] = $refers[$safeHeadline];
+			isset( $refers[$arrayKey] ) ? $refers[$arrayKey]++ : $refers[$arrayKey] = 1;
+			$refcount[$headlineCount] = $refers[$arrayKey];
 
 			# Don't number the heading if it is the only one (looks silly)
 			if( $doNumberHeadings && count( $matches[3] ) > 1) {
diff --git a/maintenance/parserTests.txt b/maintenance/parserTests.txt
index fb9708a2c7..2e72415c81 100644
--- a/maintenance/parserTests.txt
+++ b/maintenance/parserTests.txt
@@ -3551,6 +3551,17 @@ Resolving duplicate section names
 
 !! end
 
+!! test
+Resolving duplicate section names with differing case (bug 10721)
+!! input
+== Foo bar ==
+== Foo Bar ==
+!! result
+<a name="Foo_bar"></a><h2><span class="editsection">[<a href="/index.php?title=Parser_test&amp;action=edit&amp;section=1" title="Edit section: Foo bar">edit</a>]</span> <span class="mw-headline"> Foo bar </span></h2>
+<a name="Foo_Bar_2"></a><h2><span class="editsection">[<a href="/index.php?title=Parser_test&amp;action=edit&amp;section=2" title="Edit section: Foo Bar">edit</a>]</span> <span class="mw-headline"> Foo Bar </span></h2>
+
+!! end
+
 !! article
 Template:sections
 !! text
-- 
2.20.1