Shaped window support for wxMac, plus a wxSTAY_ON_TOP fix from Egon

<e_lub@yahoo.com>   wxMac requires knowledge before Create that SetShape
will be called so I also added the wxFRAME_SHAPED style flag.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@20383 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/toplevel.cpp

@@ -1002,6 +1002,9 @@ static bool do_shape_combine_region(GdkWindow* window, const wxRegion& region)
 
 bool wxTopLevelWindowGTK::SetShape(const wxRegion& region)
 {
+    wxCHECK_MSG( HasFlag(wxFRAME_SHAPED), FALSE,
+                 _T("Shaped windows must be created with the wxFRAME_SHAPED style."));
+
     GdkWindow *window = NULL;
     if (m_wxwindow)
     {