GNU bug report logs - #50762
diff-update-on-the-fly doesn't update hunk headers while regexp-replacing lines

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Konstantin Kharlamov <hi-angel <at> yandex.ru>
Subject: bug#50762: closed ()
Date: Thu, 22 May 2025 08:47:02 +0000

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Your bug report

#50762: diff-update-on-the-fly doesn't update hunk headers while regexp-replacing lines

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 50762 <at> debbugs.gnu.org.

-- 
50762: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=50762
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Konstantin Kharlamov <Hi-Angel <at> yandex.ru>
To: 50762-done <at> debbugs.gnu.org
Date: Thu, 22 May 2025 11:46:46 +0300

Thus, closing

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From: Konstantin Kharlamov <hi-angel <at> yandex.ru>
To: bug-gnu-emacs <at> gnu.org
Subject: diff-update-on-the-fly doesn't update hunk headers while
 regexp-replacing lines
Date: Thu, 23 Sep 2021 18:56:48 +0300

As title says. I think due to this bug it would make sense to have diff-update-on-the-fly set to nil by default.

# Steps to reproduce

1. In Emacs repo, `git checkout 72f8a9dd08132119a` (arbitrary commit for the sake of testcase) 
2. Create a patch from Emacs repo with `git format-patch -1 --stdout > /tmp/1.patch`, open it.
3. Note that 1st hunk has value `-2883,10 +2883,13`
4. Use regexp-replace aka `C-M-%` with `(.*^J\+.* → line1` (please replace ^J here with C-q C-j)
5. When asked for matches, press `!`, so all lines are replaced
6. Look at the first hunk again

## Expected

It changes its value to recalculation that should be happening

## Actual

It still has the older value, no recalculation has happened.

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