Handle the firstVisible item being NULL in
TREEVIEW_UpdateScrollBars().
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@ -2599,7 +2599,7 @@ TREEVIEW_UpdateScrollBars(TREEVIEW_INFO *infoPtr)
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if (vert)
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{
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si.nPage = TREEVIEW_GetVisibleCount(infoPtr);
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if ( si.nPage )
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if ( si.nPage && NULL != infoPtr->firstVisible)
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{
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si.nPos = infoPtr->firstVisible->visibleOrder;
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si.nMax = infoPtr->maxVisibleOrder - 1;
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