bug#52349: 29.0.50; vc-git and diff-mode: stage hunks

[Dmitry Gutov]

On 11.09.2022 18:05, Juri Linkov wrote:
> +              (if (string-search file-diff vc-git-patch-string)
> +                  (setq vc-git-patch-string
> +                        (string-replace file-diff "" vc-git-patch-string))

Not sure I understand this part. We're replacing some text (the diff 
file header) with empty text in the patch string? But not the whole hunk?

It might work if we removed the whole hunk as well, but we need to make 
sure that the staged contents for that file are exactly the same as what 
is contained for that file in vc-git-patch-string.

Perhaps if we called diff-file-next in addition to 
(move-beginning-of-line 1)? But we need to save both strings: and ensure 
that if there is a match for that file header, then all hunks are 
contained in the patch as well (and nothing extra, for that file).

It's complex logic, so if you manage to write a test as well, that would 
be excellent.