message: show messagebox only if not flatpak
diff: @@ -112,6 +112,9 @@ UpdateDialog::UpdateDialog(
  layout->addLayout(content);
  connect(this, &UpdateDialog::accepted, [this, platform, link] {
  +
  +#ifndef FLATAPK
  + // Only the pure linux package is missing
  if (platform == "linux") {
  QMessageBox msgBox(this);
  msgBox.setText(tr("On linux distributions the preferred way to install applications is the packet manager."));
  @@ -123,6 +126,7 @@ UpdateDialog::UpdateDialog(
  if (msgBox.exec() == QMessageBox::StandardButton::No)
  return;
  }
  +#endif
  // Start download.
  if (Updater::DownloadRef download = Updater::instance()->download(link)) {
  