Fixed popup menus opened at the wrong position (mostly noticed in Installer) with a horrible hack which I can't see how to avoid

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15941 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/kits/interface/Menu.cpp

@@ -19,6 +19,7 @@
 #include <Screen.h>
 #include <Window.h>
 
+#include <BMCPrivate.h>
 #include <MenuPrivate.h>
 #include <MenuWindow.h>
 
@@ -1429,7 +1430,11 @@ BMenu::CalcFrame(BPoint where, bool *scrollOn)
 	BMenu *superMenu = Supermenu();
 	BMenuItem *superItem = Superitem();
 
-	if (superMenu == NULL || superItem == NULL) {
+	// TODO: Horrible hack:
+	// When added to a BMenuField, a BPopUpMenu is the child of
+	// a _BMCItem_ inside a _BMCMenuBar_ to "fake" the menu hierarchy
+	if (superMenu == NULL || superItem == NULL
+		|| dynamic_cast<_BMCItem_ *>(superItem) != NULL) {
 		// just move the window on screen
 
 		if (frame.bottom > screenFrame.bottom)