From c86110d64557405234f4548a8b58a3323dfb6cd3 Mon Sep 17 00:00:00 2001
From: Brion Vibber <brion@users.mediawiki.org>
Date: Wed, 21 Jun 2006 23:13:05 +0000
Subject: [PATCH] * (bug 6398) Work around apparent PCRE bug breaking section
 editing when massively-indented preformatted text immediately followed a
 header

---
 RELEASE-NOTES       | 3 +++
 includes/Parser.php | 2 +-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/RELEASE-NOTES b/RELEASE-NOTES
index 998086f18a..90a182b5a1 100644
--- a/RELEASE-NOTES
+++ b/RELEASE-NOTES
@@ -532,6 +532,9 @@ Some default configuration options have changed:
 * (bug 6351) Update to German translation (de)
 * Respect language directionality when displaying arrow in Special:Brokenredirects
 * Remove unused "validation" table definitions from the schema files
+* (bug 6398) Work around apparent PCRE bug breaking section editing when
+  massively-indented preformatted text immediately followed a header
+
 
 == Compatibility ==
 
diff --git a/includes/Parser.php b/includes/Parser.php
index bf7e24a847..37832a9f0b 100644
--- a/includes/Parser.php
+++ b/includes/Parser.php
@@ -4327,7 +4327,7 @@ class Parser
 				(=+) # Should this be limited to 6?
 				.+?  # Section title...
 				\\2  # Ending = count must match start
-				(?:$comment|<\/?noinclude>|\s+)* # Trailing whitespace ok
+				(?:$comment|<\/?noinclude>|[ \\t]+)* # Trailing whitespace ok
 				$
 			|
 				<h([1-6])\b.*?>
-- 
2.20.1