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https://invent.kde.org/graphics/okular
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don't crash when trying to mapping an invalid proxy index in the group proxy model
svn path=/trunk/KDE/kdegraphics/okular/; revision=732110
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@ -137,6 +137,9 @@ QModelIndex PageGroupProxyModel::mapFromSource( const QModelIndex &sourceIndex )
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QModelIndex PageGroupProxyModel::mapToSource( const QModelIndex &proxyIndex ) const
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{
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if ( !proxyIndex.isValid() )
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return QModelIndex();
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if ( mGroupByPage ) {
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if ( proxyIndex.internalId() == 0 ) {
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