bug#57807: 29.0.50; Make vc-print-branch-log able to log multiple branches

[Eli Zaretskii]

> From: Sean Whitton <spwhitton@spwhitton.name>
> Date: Thu, 15 Sep 2022 09:18:13 -0700
> 
> Hello,
> 
> On Thu 15 Sep 2022 at 08:33AM +03, Eli Zaretskii wrote:
> 
> > So the difference is that what you want to see is all the branches up
> > to their HEAD, and not just branches merged into the current branch,
> > is that right?
> >
> > If so, I guess some optional feature of "C-x v L" could do that.
> > However, if the repository has many branches (and ours, for example,
> > does), wouldn't that make for a crowded and hard-t-read log buffer?
> > Perhaps asking the user for a name of one branch will be enough?  More
> > than one branch could be problematic on display, I think.
> 
> Not all branches, as indeed that would quickly become unreadable.  The
> user has to say exactly which branches they would like to be included.
> And usually you wouldn't type more than two or three.

I think 3 is already too much for the largely unidimensional display
we (and Git) provide.