message: [Qt] Enable support for Qt's HighDpiScaling
  This was missed in the bump to Qt 5.6 and should resolve issues
  with window/text scaling on High DPI devices.
diff: @@ -543,6 +543,9 @@ int main(int argc, char* argv[])
  // Generate high-dpi pixmaps
  QApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
  #endif
  +#if QT_VERSION >= 0x050600
  + QGuiApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
  +#endif
  #ifdef Q_OS_MAC
  QApplication::setAttribute(Qt::AA_DontShowIconsInMenus);
  #endif
  