Re: master 4803fba487 1/2: 'C-x v v' on a diff buffer commits it as a patch (bug#52349)

[Eli Zaretskii <eliz@gnu.org>]

> Date: Tue, 30 Aug 2022 16:52:10 +0300
> Cc: larsi@gnus.org, juri@jurta.org, emacs-devel@gnu.org
> From: Dmitry Gutov <dgutov@yandex.ru>
> 
> >> It's significant in that the starting conditions is that the files are
> >> already modified compared to the repository head, and the end goal is to
> >> be able to pick only some of those changes for commit.
> > 
> > Ouch!  Then this feature will be useless for me, and I'm sorry I
> > wasted everyone's time based on the description in NEWS, which doesn't
> > make a point of emphasizing this basic assumption.
> 
> Perhaps we could make it more useful for you as well, e.g. by applying 
> all the changes from the patch first when called with 'C-u'.

Alas, C-u already has a meaning with "C-x v v".

> But I suppose if your patches apply cleanly most of the time, it can be 
> less of a problem.

They do, when I choose them not to be rejected ;-)

> diff-mode provides commands to delete hunks, split them, and even allows 
> one to edit individual characters (something that 'git add -p' doesn't 
> provide). So I'd argue this way might even be more powerful.

From my POV, a better UI would be to enter diff-mode _after_ the user
invoked VC to commit the changes, but asked specifically to commit
them selectively.  Not the other way around.  IOW, the process of
generating the diffs buffer should be part of the command execution,
not a prerequisite for it.