bug#32420: 26.1.50; Ibuffer: Detect correctly the buffers running a process

[Eli Zaretskii]

> From: Tino Calancha <tino.calancha@gmail.com>
> Date: Sun, 12 Aug 2018 02:13:20 +0900 (JST)
> cc: 32420@debbugs.gnu.org
> 
> >> emacs -Q
> >> M-x info RET
> >> m Emacs RET
> >> M-x ibuffer RET
> >> ;; Ibuffer wrongly reports *info* buffer as running a process.
> >
> > How do you see it reporting a process?  What I see is that it reports
> > a pseudo-file for it.  Am I missing something?
> Attached 1 picture.
> It shows at the bottom the line:
> 3 buffers            2515909                  1 file, 1 process

Ah, okay.  So, to fix this, isn't it better to see if the current
buffer is a process-buffer of some process in process-list?