static Map<TextImageAction, File> filesForNiceButtons_map = weakIdentityHashMap();

static L<TextImageAction> filesForNiceButtons(L<File> l, final O/*VF1<File>*/ action) {
  ret mapAndRecordToMap_reversed(filesForNiceButtons_map, l, func(final File f) -> TextImageAction {
    TextImageAction(f.getName(), isImageFile(f) ? #1101250 : #1101231, r { pcallF(action, f) })
  });
}

static L<TextImageAction> filesForNiceButtons(L<File> l) {
  ret filesForNiceButtons(l, voidfunc(final File f) { thread { genericUI_openFile(f) }});
}