Fix crashing in SetView.

layout/xul/base/src/outliner/src/nsOutlinerBodyFrame.cpp

@@ -416,6 +416,10 @@ NS_IMETHODIMP nsOutlinerBodyFrame::SetView(nsIOutlinerView * aView)
 {
   // First clear out the old view.
   nsCOMPtr<nsIBoxObject> box(do_QueryInterface(mOutlinerBoxObject));
+  if (!box)
+    return NS_OK; // Just ignore the call.  An initial reflow when it comes in
+                  // will retrieve the view from the box object.
+  
   nsAutoString view; view.AssignWithConversion("view");
   
   if (mView) {

layout/xul/base/src/outliner/src/nsOutlinerBoxObject.cpp

@@ -160,11 +160,14 @@ NS_IMETHODIMP nsOutlinerBoxObject::SetView(nsIOutlinerView * aView)
   nsIOutlinerBoxObject* body = GetOutlinerBody();
   if (body)
     return body->SetView(aView);
-  else {
-    nsCOMPtr<nsISupports> suppView(do_QueryInterface(aView));
+  
+  nsCOMPtr<nsISupports> suppView(do_QueryInterface(aView));
+  if (suppView)
     SetPropertyAsSupports(NS_LITERAL_STRING("view").get(), suppView);
-    return NS_OK;
-  }
+  else
+    RemoveProperty(NS_LITERAL_STRING("view").get());
+
+  return NS_OK;
 }
 
 NS_IMETHODIMP nsOutlinerBoxObject::GetFocused(PRBool* aFocused)

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

@@ -416,6 +416,10 @@ NS_IMETHODIMP nsOutlinerBodyFrame::SetView(nsIOutlinerView * aView)
 {
   // First clear out the old view.
   nsCOMPtr<nsIBoxObject> box(do_QueryInterface(mOutlinerBoxObject));
+  if (!box)
+    return NS_OK; // Just ignore the call.  An initial reflow when it comes in
+                  // will retrieve the view from the box object.
+  
   nsAutoString view; view.AssignWithConversion("view");
   
   if (mView) {

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

@@ -160,11 +160,14 @@ NS_IMETHODIMP nsOutlinerBoxObject::SetView(nsIOutlinerView * aView)
   nsIOutlinerBoxObject* body = GetOutlinerBody();
   if (body)
     return body->SetView(aView);
-  else {
-    nsCOMPtr<nsISupports> suppView(do_QueryInterface(aView));
+  
+  nsCOMPtr<nsISupports> suppView(do_QueryInterface(aView));
+  if (suppView)
     SetPropertyAsSupports(NS_LITERAL_STRING("view").get(), suppView);
-    return NS_OK;
-  }
+  else
+    RemoveProperty(NS_LITERAL_STRING("view").get());
+
+  return NS_OK;
 }
 
 NS_IMETHODIMP nsOutlinerBoxObject::GetFocused(PRBool* aFocused)