bug#35385: 27.0.50; Make dired-dwim-target aware of other frames

[martin rudalics]

> BTW, while looking at windows walking functions, I noticed
> an opportunity for simplification.
>
> Martin, could you please confirm if I'm not mistaken with this patch:

Removing the

    (when (framep all-frames)
      (select-window (frame-first-window all-frames) 'norecord))

LGTM.  Whether we should remove the

  (save-selected-window

envelope is another question.  If FUN changes the selected window,
we'd now have a side effect we didn't have so far.

Personally, I would always try to use 'walk-window-tree' instead of
'walk-windows' reserving the latter for operations that are allowed to
create or delete windows.

martin