bug#13594: 24.2.92; [PATCH] compilation-start doesn't consider nil OUTWIN

[martin rudalics]

> But such some window at any cost should be harmless when the caller goes
> to use the returned window e.g. to get its buffer with `window-buffer', etc.

Returning the selected window is harmless.

> This is why using a hidden window is better, despite its invisibility
> the window will be still correct in all its properties.

Deleting the last visible Emacs frame and subsequently switching off
your machine is not entirely harmless.

martin