Function get_layer

UnitTests/UnitTest_AttachDetach/DemoKeeper.cpp:63–68

	}

	static std::string_view get_layer()
	{
		const int SIZE = 4;
		static const std::string_view names[SIZE] = {std::string_view{}, "Main", "Overlapped", "Popup"};
		return names[random(SIZE)];
	}

	static MyGUI::IntCoord get_coord()
	{