bug#34944: 27.0.50; FR: support amend in vc-hg

[Dmitry Gutov]

On 22.03.2019 12:44, Philipp Stephani wrote:
> The Git integration for vc.el supports amending commits via a magic
> changelog header.  Mercurial has the same functionality, see
> https://www.mercurial-scm.org/wiki/EditingHistory#Amending_the_latest_changeset_with_commit_--amend.
> If would be great to support this in Emacs as well.  Maybe the Git
> approach could even move into main VC, and made available to all
> backends that support amending?

Here's a patch you can try (attached).

No backend API change necessary, so far.

Are there many backends that could support amending?

vc-hg-amend.diff
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