back out joki's click event fix because it doesn't totally work right. toolboxes now collapse (most of the time).

layout/xul/base/src/nsToolboxFrame.cpp

@@ -667,7 +667,10 @@ nsToolboxFrame :: HandleEvent ( nsIPresContext& aPresContext,
   switch ( aEvent->message ) {
 
     case NS_MOUSE_LEFT_CLICK:
-//    case NS_MOUSE_LEFT_BUTTON_UP:
+      // BUG 3752 aEvent->point is invalid here.
+      break;
+
+    case NS_MOUSE_LEFT_BUTTON_UP:
       OnMouseLeftClick ( aEvent->point );
       break;