bug#20717: attribution of gitmerge.el merged entries in generated ChangeLog

[Eli Zaretskii <eliz@gnu.org>]

> From: Glenn Morris <rgm@gnu.org>
> Cc: 20717@debbugs.gnu.org
> Date: Wed, 10 Jun 2015 21:28:08 -0400
> 
> Eli Zaretskii wrote:
> 
> > Do logs of changes made on feature branches also appear like that, and
> > are also misplaced?  E.g., what do you get there of the commits on the
> > large-fonts branch I merged today?
> 
> See
> http://lists.gnu.org/archive/html/emacs-diffs/2015-06/msg00090.html
> 
> The word "merge" isn't even mentioned in gitlog-to-changelog, and it's 7
> years old, so I assume no-one cares about such things. Frankly, it's not
> much more than a dump of "git log" with some formatting tweaks to make
> it look more like a ChangeLog.

So should we manually correct the most glaring problems of the result
of this?  For example, the logs for commits I made on that branch
should be deleted, as there's a summary log for the merge-commit later
on that covers them all.

Perhaps we should recommend that people use the ";" trick in the log
messages they make on branches they intend to merge onto master later?