bug#52926: dired-copy-filename-as-kill should beep if not on a file line

[Eli Zaretskii]

> From: 積丹尼 Dan Jacobson <jidanni@jidanni.org>
> Cc: 52926-done@debbugs.gnu.org
> Date: Sun, 02 Jan 2022 02:57:51 +0800
> 
> >>>>> "EZ" == Eli Zaretskii <eliz@gnu.org> writes:
> 
> EZ> Why beep?  It does a useful job in that case as well.
> 
> EZ> Closing.
> 
> But whatever it does in that case, it doesn't put it on the kill ring,
> so one cannot yank it.

Of course, it does.  Try "C-y" after that in some other (writable)
buffer, and you will see.

> One just ends up yanking what was already in the kill ring.

Not here.