static L<wmctrl_Entry> dm_windows_filterOnTitle(final F1<S, Bool> f) {
  ret filter(dm_windows(), w -> callF(f, w.windowTitle));
}

static L<wmctrl_Entry> dm_windows_filterOnTitle(final IF1<S, Bool> f) {
  ret filter(dm_windows(), w -> callF(f, w.windowTitle));
}