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how to `register' vc-hg-region-history in vc-region-history?

From: Uwe Brauer
Subject: how to `register' vc-hg-region-history in vc-region-history?
Date: Thu, 18 Jan 2018 15:27:14 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux)


I just tried out a new function
(right now I don't care much about keybinding and font locking

So the function (defun vc-hg-region-history (file buffer lfrom lto) Seems a natural generalization of vc-git-region-history However I don't see how to tell vc-region-history to tell that the new function now exists. I tried to debug it

(defun vc-region-history (from to) (vc-call region-history file buf lfrom lto)
And there vc aborts for HG. What do I miss?

Uwe Brauer

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