Bug 346957 Reconnect the view to the tree after a reframe r+sr=roc

layout/xul/base/src/tree/src/nsTreeBoxObject.cpp

@@ -161,7 +161,18 @@ nsTreeBoxObject::GetTreeBody()
 
 NS_IMETHODIMP nsTreeBoxObject::GetView(nsITreeView * *aView)
 {
-  if (!mView && GetTreeBody()) {
+  if (!mTreeBody) {
+    if (!GetTreeBody()) {
+      // Don't return an uninitialised view
+      *aView = nsnull;
+      return NS_OK;
+    }
+
+    if (mView)
+      // Our new frame needs to initialise itself
+      return mTreeBody->GetView(aView);
+  }
+  if (!mView) {
     nsCOMPtr<nsIDOMXULElement> xulele = do_QueryInterface(mContent);
     if (xulele) {
       // See if there is a XUL tree builder associated with the element
@@ -175,6 +186,7 @@ NS_IMETHODIMP nsTreeBoxObject::GetView(nsITreeView * *aView)
         NS_ENSURE_TRUE(rv, rv);
       }
 
+      // Initialise the frame and view
       mTreeBody->SetView(mView);
     }
   }