GNU bug report logs - #61396
diff mode could distinguish changed from deleted lines

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Message #92 received at 61396 <at> debbugs.gnu.org (full text, mbox):

From: Juri Linkov <juri <at> linkov.net>
To: Samuel Wales <samologist <at> gmail.com>
Cc: 61396 <at> debbugs.gnu.org, Stefan Monnier <monnier <at> iro.umontreal.ca>
Subject: Re: bug#61396: diff mode could distinguish changed from deleted lines
Date: Sun, 03 Sep 2023 20:29:14 +0300

>   -this is a line that ^looks deleted, but it is changed
> ...
>   +this is a line that REALLY looks deleted, but it is changed
>
> what is not indicated for the user is at the ^.  i would like it if
> diff mode if possible showed that text was deleted there.

Thanks for the feature request, this would be a very useful feature.
There is already a TODO item for implementing it:

  (defun smerge--refine-highlight-change (beg match-num1 match-num2 props)
    ;; TODO: Add a property pointing to the corresponding text in the
    ;; other region.

Maybe Stefan could suggest a hint on how better to proceed.

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