From 2c9122192d2995371d1a72700be5e95c41018941 Mon Sep 17 00:00:00 2001
From: Albert Astals Cid <tsdgeos@terra.es>
Date: Mon, 16 Jan 2012 21:04:15 +0100
Subject: [PATCH] Qt decided to start passing invalid indexes to mapFromSource,
 do not crash on them

BUGS: 291278
FIXED-IN: 4.8.0
---
 ui/annotationproxymodels.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/ui/annotationproxymodels.cpp b/ui/annotationproxymodels.cpp
index 1f097aba3..78a66fea7 100644
--- a/ui/annotationproxymodels.cpp
+++ b/ui/annotationproxymodels.cpp
@@ -405,6 +405,9 @@ QModelIndex AuthorGroupProxyModel::parent( const QModelIndex &index ) const
 
 QModelIndex AuthorGroupProxyModel::mapFromSource( const QModelIndex &sourceIndex ) const
 {
+    if ( !sourceIndex.isValid() )
+        return QModelIndex();
+
     const AuthorGroupItem *item = d->mRoot->findIndex( sourceIndex );
     if ( !item )
         return QModelIndex();