bug#23999: 25.0.95; Emacs hangs in rectangle-mark-mode with numeric prefix argument to `C-f'

[Eli Zaretskii <eliz@gnu.org>]

> From: Stephen Berman <stephen.berman@gmx.net>
> Cc: 23999@debbugs.gnu.org,  jwiegley@gmail.com,  monnier@iro.umontreal.ca
> Date: Fri, 22 Jul 2016 13:19:14 +0200
> 
> On Fri, 22 Jul 2016 12:31:33 +0300 Eli Zaretskii <eliz@gnu.org> wrote:
> 
> >> > I'm fine with pushing to master if no one objects to this particular
> >> > solution.
> >> 
> >> Why not emacs-25, given that the behavior is a regression from 24.5 (and
> >> of course assuming the fix doesn't break anything else)?
> >
> > Because a workaround exists, 
> 
> You mean just repeating a motion command instead of using a numeric
> prefix?

Yes.

Also, the situation seems to be rather rare, or else I don't
understand how come we didn't hear about it until now.

> >                              and because we cannot assume it doesn't
> > break anything else without prolonging the pretest.
> 
> Thanks for your healthy scepticism here

No wisdom there, just a lot of gray hair.  Thanks for double-checking.

> If you think this corrected patch should still not go into emacs-25,
> perhaps there should be a note in PROBLEMS, since motion commands in
> general accept a numeric prefix and someone who successfully used
> rectangle-mark-mode that way in 24.5 will naturally assume it works in
> 25.1 and be surprised when Emacs hangs.

What do others think?  John?