bug#24962: 26.0.50; list-buffers doesn't show buffers w/ name " "... visiting a file

[Tino Calancha]

Clément Pit--Claudel <clement.pit@gmail.com> writes:

> Could we fix the manual instead? Or do we have evidence that all modes
> that use temporary buffers visiting files set buffer-file-name to nil
> to prevent these buffers from being listed?
They shouln't automatically set `buffer-file-name', that is up to the
user.  Indeed, as Eli said, temporary buffers has such variable set to nil.

Ibuffer doesn't show the buffer ' foo' visiting a file by default.
Well, that is customizable using `ibuffer-maybe-show-predicates'.
A prefix argument in `ibuffer-update' toggle this variable.

One user might intentionally or accidentaly change the name
of a buffer visiting a file.  If we don't show it in `list-buffers'
the user might believe that the file has being deleted.
IMO one buffer visiting a file is always relevant; it's better if
we show it.