added calls for invalidating the dc setup on mac explicitely (needed in case of nested updates (e.g. writing a message to a text control while being in paint mode)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@9438 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/mac/uma.cpp

@@ -834,6 +834,7 @@ OSErr UMASetKeyboardFocus				(WindowPtr 				inWindow,
 	}
 #endif
 	SetPort( port ) ;
+	wxDC::MacInvalidateSetup() ;
 	return err ;
 }