bug#81491: 30.2; Doc of `image-dired-display-*

> > > What happens if you don't pass the prefix argument to
> > > image-dired-display-image?
> > 
> > I believe I covered that above.  For Emacs 30.2 (which
> > I think is what you're asking about) - I get an error:
> > 
> >   > > > Before I answer, I need you to try and describe what
> >   > > > happens in a modern Emacs when you don't pass that
> >   > > > argument.  I suspect that what happens completely
> >   > > > removes the need for the argument.
> >   > > 
> >   > > With Emacs 30.2 I get the error "No buffer named
> >   > > *image-dired-display-image*", whether or not I
> >   > > provide a prefix arg.
> > 
> > (I also mentioned what happens for earlier releases.)
> 
> I cannot see any connection between the change in the signature of
> image-dired-display-image and the error message, sorry.

Nor can I.  I'm not aware of creating or needing to create
any such buffer (or what it needs to be/have).  Perhaps
Emacs 29+ expects such a buffer to pre-exist, and Emacs
previously didn't expect that?

I said this earlier; maybe it's relevant in this regard?

  In my context there's no need for a user to be
  in `image-dired-thumbnail-mode' - just as there
  wasn't any such need in the previously existing
  vanilla command `image-dired-dired-display-image'.

Does that error perhaps come from not being in that mode?
Previously, my command worked from a regular Dired buffer
(`dired-mode').

> > To be clear, I'm willing to not belabor this and just
> > remove (give up on) my command.  But if you really do
> > want to try the code:
> 
> Not really, I just thought it would explain the error message.
> 
> Anyway, at this point I must bow out of the attempt to help you
> understand how to change your code to avoid the error.  I hope someone
> else will be able to do that.

I'll just drop the command for Emacs 29+.  Feel free to
close the bug as won't fix or whatever.  But you did fix
some of the doc, so maybe you want to close it normally.
Thx.