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

[Juri Linkov]

>> Thanks, I'm going to try it out.
>
> It looks like I need to call (minibuffer-depth) like
> display-buffer-override-next-command does.  Updated patch attached.

I tested your latest patch with many vc commands, and everything
works nicely, even M-x for vc commands without a keybinding
and with a prefix arg is supported like in

  C-x v ! C-u M-x vc-log-search RET

(C-u is not needed for vc-log-search anymore,
it's just for testing a prefix arg here).

> I realised that we could add an override inside vc-read-revision, and
> potentially other places, which makes it considerably less annoying.
> Done in the attached.

Maybe it's fine to disable editing for vc-read-revision,
but I'm not sure about other commands, such as e.g.
vc-git-log-incoming that runs two git commands:

  vc-git-command fetch
  vc-git-command log

I see no problem to type an extra RET even for a secondary git command.
But it helps in case when someone really wants to edit it.