Complete wxEVT_MENU_{OPEN,CLOSE} implementation in wxMSW and wxOSX.

Set the wxMenu correctly for wxEVT_MENU_CLOSE events in wxMSW.

Set the menu id correctly to allow wxMenuEvent::IsPopup() to work for both
wxEVT_MENU_OPEN and wxEVT_MENU_CLOSE in wxOSX.

Closes #11313.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@70151 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/osx/menu.h

@@ -83,6 +83,10 @@ private:
     // terminate the current radio group, if any
     void EndRadioGroup();
 
+    // Common part of HandleMenu{Opened,Closed}().
+    void DoHandleMenuOpenedOrClosed(wxEventType evtType);
+
+
     // if TRUE, insert a breal before appending the next item
     bool m_doBreak;