Fix HMENU to wxMenu translation in wxMSW code.

We didn't find the menus corresponding to the submenu handles. This resulted
in incorrect processing of EVT_UPDATE_UI events for the submenus and probably
other problems.

Fix this by searching for the HMENU recursively in all menus.

Closes #13080.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@67355 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/menu.h

@@ -102,6 +102,9 @@ public:
         m_maxAccelWidth = -1;
     }
 
+    // get the menu with given handle (recursively)
+    wxMenu* MSWGetMenu(WXHMENU hMenu);
+
 private:
     void CalculateMaxAccelWidth();
 
@@ -208,6 +211,9 @@ public:
     void Refresh( bool eraseBackground,
                           const wxRect *rect = (const wxRect *) NULL ) { wxWindow::Refresh(eraseBackground, rect); }
 
+    // get the menu with given handle (recursively)
+    wxMenu* MSWGetMenu(WXHMENU hMenu);
+
 protected:
     // common part of all ctors
     void Init();