static JTextField dm_mergeWithTopInput(final JTextField tf) {
  final DynModule m = dm_current_mandatory();
  final Var<Bool> loopPreventer = new(false);
  onChange(tf, r { if (!loopPreventer!) dm_setTopInput(getText(tf)) });
  dm_onTopInputChanged(voidfunc(fS s) {
    switch to m.q();
    temp tempSetVar(loopPreventer, true);
    setText(tf, s);
  });
  onEnter(tf, rThread { dm_setTopInputAndFireWithInfo(getText(tf), "typed") });
  ret tf;
}