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<b>Warning</b>:  session_start(): Failed to read session data: files (path: /var/lib/php/sessions) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
// if f returns true, form is hidden
static void disableButtonWhileCalcing2(final O /*F0<Bool>*/ f) {
  final JButton button = heldInstance(JButton);
  disableButton(button);
  thread {
    try {
      bool ok = isTrue(callF(f));
      if (ok) disposePossiblyInternalFrame(button);
    } finally {
      enableButton(button);
    }
  }
}