message: Unminimize references window on Windows when activated
  Explicitly unminize the window if it is iconized. This is necessary on
  Windows, but happens automatically on macOS.
  Fixes
diff: @@ -63,6 +63,8 @@ FileViewer *FileViewer::GetAndActivate()
  if (!ms_instance)
  ms_instance = new FileViewer(nullptr);
  ms_instance->Show();
  + if (ms_instance->IsIconized())
  + ms_instance->Iconize(false);
  ms_instance->Raise();
  return ms_instance;
  }
  