From 37e652dcfa9a359ff9b520815fedd39e1acbbcf8 Mon Sep 17 00:00:00 2001
From: "roc+%cs.cmu.edu" <roc+%cs.cmu.edu@18797224-902f-48f8-a5cc-f745e15eee43>
Date: Fri, 22 Feb 2008 01:02:52 +0000
Subject: [PATCH] Bug 393490. When subsuming an interval, we need to merge its
 beginning into the current interval as well as its end, because it might
 start before the current interval. r+sr=dbaron

git-svn-id: svn://10.0.0.236/trunk@246252 18797224-902f-48f8-a5cc-f745e15eee43
---
 mozilla/layout/generic/nsIntervalSet.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mozilla/layout/generic/nsIntervalSet.cpp b/mozilla/layout/generic/nsIntervalSet.cpp
index ce6a9aca31f..f103963523f 100644
--- a/mozilla/layout/generic/nsIntervalSet.cpp
+++ b/mozilla/layout/generic/nsIntervalSet.cpp
@@ -88,6 +88,7 @@ void nsIntervalSet::IncludeInterval(coord_type aBegin, coord_type aEnd)
 
     Interval *subsumed = newInterval->mNext;
     while (subsumed && subsumed->mBegin <= aEnd) {
+        newInterval->mBegin = PR_MIN(newInterval->mBegin, subsumed->mBegin);
         newInterval->mEnd = PR_MAX(newInterval->mEnd, subsumed->mEnd);
         newInterval->mNext = subsumed->mNext;
         FreeInterval(subsumed);