static AutoCloseable onClipboardFile_monitorRegularly(double seconds, final VF1<File> f) {
  new Var<File> last;
  
  ret combineAutoCloseables(onClipboardFile(voidfunc(File file) {
    last.set(file);
    callF(f, file);
  }), timerAsAutoCloseable(doEvery(seconds, r {
      File file = fileFromClipboard();
      if (file != null && setVar_trueIfChanged(last, file))
        callF(f, file);
    })));
}