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bug#53398: 29.0.50; narrow-to-region induces buffer recentering
From: |
Eli Zaretskii |
Subject: |
bug#53398: 29.0.50; narrow-to-region induces buffer recentering |
Date: |
Fri, 21 Jan 2022 09:07:52 +0200 |
> From: Jose A Ortega Ruiz <jao@gnu.org>
> Date: Thu, 20 Jan 2022 20:59:25 +0000
>
> (defun message-kill-to-signature (&optional arg)
> "Kill all text up to the signature.
> If a numeric argument or prefix arg is given, leave that number
> of lines before the signature intact."
> (interactive "P" message-mode)
> (save-excursion
> (save-restriction
> (let ((point (point)))
> (narrow-to-region point (point-max)) ;;;;;;
> <------------------------
> (message-goto-signature)
> (unless (eobp)
> (if (and arg (numberp arg))
> (forward-line (- -1 arg))
> (end-of-line -1)))
> (unless (= point (point))
> (kill-region point (point))
> (unless (bolp)
> (insert "\n")))))))
>
> so i am (wild) guessing that the spurious recenter might be related with
> save-restriction workings in combination with narrow, but i don't really
> know what i'm talking about :)
Any chance of having a reproduction recipe that is simpler and
preferably doesn't include message.el at all? IOW, if your guess is
correct, and the problem is inside narrow-to-region, we shouldn't need
this elaborate setup to show the issue, right? Can you show such a
recipe?
Also, you say "previous behavior was", but when did you see that
previous behavior and in what Emacs version?
> The only variable related to scroll i can see changed from its default
> value in my config is scroll-preserve-screen-position, which i set to
> 'always, but changing its value doesn't affect the behaviour above in
> any way.
So you are saying that this recentering doesn't happen in "emacs -Q",
even if you do invoke that Message mode command? If so, please try
to find which of your customizations do affect it.
- bug#53398: 29.0.50; narrow-to-region induces buffer recentering, Jose A Ortega Ruiz, 2022/01/20
- bug#53398: 29.0.50; narrow-to-region induces buffer recentering,
Eli Zaretskii <=
- bug#53398: 29.0.50; narrow-to-region induces buffer recentering, Lars Ingebrigtsen, 2022/01/21
- bug#53398: 29.0.50; narrow-to-region induces buffer recentering, Jose A Ortega Ruiz, 2022/01/22
- bug#53398: 29.0.50; narrow-to-region induces buffer recentering, Eli Zaretskii, 2022/01/23
- bug#53398: 29.0.50; narrow-to-region induces buffer recentering, Lars Ingebrigtsen, 2022/01/23
- bug#53398: 29.0.50; narrow-to-region induces buffer recentering, Jose A Ortega Ruiz, 2022/01/23
- bug#53398: 29.0.50; narrow-to-region induces buffer recentering, Lars Ingebrigtsen, 2022/01/23
- bug#53398: 29.0.50; narrow-to-region induces buffer recentering, Eli Zaretskii, 2022/01/23
- bug#53398: 29.0.50; narrow-to-region induces buffer recentering, Jose A Ortega Ruiz, 2022/01/23