Initializes a menuHandle to nil before sending it in an event. I don't have a bug report for that. I don't even remember what it is for. This fix has been sitting for months in my tree.

widget/src/mac/nsMenuBar.cpp

@@ -624,7 +624,7 @@ NS_METHOD nsMenuBar::Paint()
       menu->IsHelpMenu(&isHelpMenu);
     if (isHelpMenu)
     {
-      MenuHandle helpMenuHandle;
+      MenuHandle helpMenuHandle = nil;
 #if !TARGET_CARBON
       ::HMGetHelpMenuHandle(&helpMenuHandle);
       menu->SetNativeData((void*)helpMenuHandle);