bug#34749: 26.1; `delete-windows-on': (1) doc, (2) bug, (3) bug, (4) candidates

[martin rudalics]

> It seems like the interactive behavior is not correct, as well as being
> poorly documented.  It's hard to know just what behavior was intended,
> or what behavior would be best if (as it seems) we still need to design
> this.

If anyone has any ideas, we should implement that.  Suggestions highly
welcome.

> 3. Why is `B' used in the interactive spec instead of `b'?  What's the
> use case for deleting windows showing a nonexistent buffer?

I hopefully fixed that now on master.

> 4. The buffer candidates available for completion (which should also be
> the only buffer names available for entry - see #3) should depend on
> which frames are used, i.e., on the prefix arg or its absence.
>
> You should be presented only with the names of buffers that are actually
> shown in windows on the frames that you've chosen to consider for
> window-deletion.

Good idea.

martin