Fix regression in wxDC::Clear() and make wxGCDC::Clear() consistent with it by using white if the background brush hadn't been explicitly set. See https://github.com/wxWidgets/wxWidgets/pull/1582
Fix regression in wxDC::Clear() and make wxGCDC::Clear() consistent with it by using white if the background brush hadn't been explicitly set. See https://github.com/wxWidgets/wxWidgets/pull/1582