bug#34949: 27.0.50; Docstring of `vc-deduce-fileset' incomplete

[Dmitry Gutov]

On 30.03.2020 01:27, Juri Linkov wrote:
> > > > However! vc-dir-mark-all-files has a special behavior when it's called with
> > > > C-u: it tries to mark all files in the current VC-Dir buffer.
> > > Or equivalent behavior is when typing 'M' at the top of VC-Dir buffer.
> >
> > Not exactly: here it only marks the files in the same state as the first
> > file in the buffer.
>
> Right, it affects only the files in the root directory.

Ah, right. Indeed.

> > I really think we should optimize for the most frequent operation
> > there. Otherwise, 'C-u M' remains fairly useless (but still takes up a key
> > sequence). The fact that it can mark a set of files in incompatible
> > statuses, and nobody has filed a bug report about that until now, likely
> > indicates that people don't often use it. Or don't use it at all.
>
> Actually, marking all files with 'C-u M' is not useless.  There are
> other VC commands that make sense to run on all marked files, e.g.
> search in all files marked by 'C-u M', query-replace, delete, etc.

Hmm, you might be right. If we're sure that people do take advantage of 
that, let's keep it.

We could tweak it a little, though. Like:

          M -> mark all files in the same status
      C-u M -> mark all registered files
  C-u C-u M -> mark all files in the vc-dir buffer

Or bind vc-dir-mark-registered to a new char indeed, e.g. 'r'.