From be87817fb022a57fcc11345c2669d956cb7aa4dd Mon Sep 17 00:00:00 2001
From: "alecf%netscape.com"
 <alecf%netscape.com@18797224-902f-48f8-a5cc-f745e15eee43>
Date: Fri, 5 Nov 1999 21:51:42 +0000
Subject: [PATCH] fix for #17763 - initialize cellFrame so that if it's not
 found, the null check succeeds r=hyatt a=chofmann

git-svn-id: svn://10.0.0.236/trunk@52866 18797224-902f-48f8-a5cc-f745e15eee43
---
 mozilla/layout/xul/base/src/nsTreeFrame.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/mozilla/layout/xul/base/src/nsTreeFrame.cpp b/mozilla/layout/xul/base/src/nsTreeFrame.cpp
index 5e6800783f2..0187b7fbd7b 100644
--- a/mozilla/layout/xul/base/src/nsTreeFrame.cpp
+++ b/mozilla/layout/xul/base/src/nsTreeFrame.cpp
@@ -74,9 +74,11 @@ void nsTreeFrame::SetSelection(nsIPresContext& aPresContext, nsTreeCellFrame* aF
   nsCOMPtr<nsIContent> cellContent;
   aFrame->GetContent(getter_AddRefs(cellContent));
 
+  if (!cellContent) return;
   nsCOMPtr<nsIContent> rowContent;
   cellContent->GetParent(*getter_AddRefs(rowContent));
 
+  if (!rowContent) return;
   nsCOMPtr<nsIContent> itemContent;
   rowContent->GetParent(*getter_AddRefs(itemContent));
 
@@ -210,7 +212,7 @@ nsTreeFrame::HandleEvent(nsIPresContext& aPresContext,
       treeRowGroup->EnsureRowIsVisible(rowIndex);
 
       // Now that the row is scrolled into view, we have a frame created. We can retrieve the cell.
-      nsTreeCellFrame* cellFrame;
+      nsTreeCellFrame* cellFrame=nsnull;
       treeRowGroup->GetCellFrameAtIndex(rowIndex, cellIndex, &cellFrame);
       if (!cellFrame)
         return NS_OK; // No cell. Whatever. Bail.