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Subject: bug#78124: 30.1; `revert-buffer' regression
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Thread-Topic: 30.1; `revert-buffer' regression
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Date: Mon, 28 Apr 2025 23:20:37 +0000
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I didn't find anything about this in NEWS, so I'm assuming this change
in behavior isn't intended.  And I HOPE it's not intended.

emacs -Q

Visit any file, say foo.el.

Use `C-x C-q' to make the buffer read-only.

M-: (revert-buffer t t)

The buffer should be changed back to writable, but it remains
read-only.  This is not the case in any prior Emacs release.

Reversion should restore the state of the saved file to the buffer,
including whether the file itself is read-only.

I bind this command to F5, so the key reverts, as on Windows:

(defun revert-buffer-no-confirm ()
  "Revert buffer without confirmation."
  (interactive) (revert-buffer t t))

Useless now.

In GNU Emacs 30.1 (build 2, x86_64-w64-mingw32) of 2025-02-23 built on
 AVALON
Windowing system distributor 'Microsoft Corp.', version 10.0.26100
System Description: Microsoft Windows 10 Pro (v10.0.2009.26100.3775)

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Drew Adams <drew.adams@HIDDEN>
Subject: bug#78124: Acknowledgement (30.1; `revert-buffer' regression)
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Date: Mon, 28 Apr 2025 23:22:06 +0000

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Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#78124: 30.1; `revert-buffer' regression
Resent-From: =?UTF-8?Q?K=C3=A9vin?= Le Gouguec <kevin.legouguec@HIDDEN>
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Date: Tue, 29 Apr 2025 08:07:47 +0200
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Drew Adams via "Bug reports for GNU Emacs, the Swiss army knife of text
editors" <bug-gnu-emacs@HIDDEN> writes:

> I didn't find anything about this in NEWS, so I'm assuming this change
> in behavior isn't intended.  And I HOPE it's not intended.
>
> emacs -Q
>
> Visit any file, say foo.el.
>
> Use `C-x C-q' to make the buffer read-only.
>
> M-: (revert-buffer t t)
>
> The buffer should be changed back to writable, but it remains
> read-only.  This is not the case in any prior Emacs release.

This describes the effect of=E2=80=A6

  [NEWS]
  ** New variable 'revert-buffer-restore-functions'.
  It helps to preserve various states after reverting the buffer.

  [files.el]
  (defvar revert-buffer-restore-functions '(revert-buffer-restore-read-only)
    "Functions to preserve any state during `revert-buffer'.
    =E2=80=A6")

=E2=80=A6 if I am not mistaken?

> Reversion should restore the state of the saved file to the buffer,
> including whether the file itself is read-only.
>
> I bind this command to F5, so the key reverts, as on Windows:
>
> (defun revert-buffer-no-confirm ()
>   "Revert buffer without confirmation."
>   (interactive) (revert-buffer t t))
>
> Useless now.
>
> In GNU Emacs 30.1 (build 2, x86_64-w64-mingw32) of 2025-02-23 built on
>  AVALON
> Windowing system distributor 'Microsoft Corp.', version 10.0.26100
> System Description: Microsoft Windows 10 Pro (v10.0.2009.26100.3775)

Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#78124: 30.1; `revert-buffer' regression
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Date: Tue, 29 Apr 2025 08:07:47 +0200
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Drew Adams via "Bug reports for GNU Emacs, the Swiss army knife of text
editors" <bug-gnu-emacs@HIDDEN> writes:

> I didn't find anything about this in NEWS, so I'm assuming this change
> in behavior isn't intended.  And I HOPE it's not intended.
>
> emacs -Q
>
> Visit any file, say foo.el.
>
> Use `C-x C-q' to make the buffer read-only.
>
> M-: (revert-buffer t t)
>
> The buffer should be changed back to writable, but it remains
> read-only.  This is not the case in any prior Emacs release.

This describes the effect of=E2=80=A6

  [NEWS]
  ** New variable 'revert-buffer-restore-functions'.
  It helps to preserve various states after reverting the buffer.

  [files.el]
  (defvar revert-buffer-restore-functions '(revert-buffer-restore-read-only)
    "Functions to preserve any state during `revert-buffer'.
    =E2=80=A6")

=E2=80=A6 if I am not mistaken?

> Reversion should restore the state of the saved file to the buffer,
> including whether the file itself is read-only.
>
> I bind this command to F5, so the key reverts, as on Windows:
>
> (defun revert-buffer-no-confirm ()
>   "Revert buffer without confirmation."
>   (interactive) (revert-buffer t t))
>
> Useless now.
>
> In GNU Emacs 30.1 (build 2, x86_64-w64-mingw32) of 2025-02-23 built on
>  AVALON
> Windowing system distributor 'Microsoft Corp.', version 10.0.26100
> System Description: Microsoft Windows 10 Pro (v10.0.2009.26100.3775)

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Date: Tue, 29 Apr 2025 09:22:29 +0300
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tags 78124 notabug
thanks

> Date: Mon, 28 Apr 2025 23:20:37 +0000
> From:  Drew Adams via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@HIDDEN>
> 
> I didn't find anything about this in NEWS, so I'm assuming this change
> in behavior isn't intended.  And I HOPE it's not intended.
> 
> emacs -Q
> 
> Visit any file, say foo.el.
> 
> Use `C-x C-q' to make the buffer read-only.
> 
> M-: (revert-buffer t t)
> 
> The buffer should be changed back to writable, but it remains
> read-only.  This is not the case in any prior Emacs release.

This is a (new) feature.  The behavior change was in Emacs 29, where
we have this in NEWS:

  ** Explicitly-set read-only state is preserved when reverting a buffer.
  If you use the 'C-x C-q' command to change the read-only state of the
  buffer and then revert it, Emacs would previously use the file
  permission bits to determine whether the buffer should be read-only
  after reverting the buffer.  Emacs now remembers the decision made in
  'C-x C-q'.

The change was (briefly) discussed in bug#35166.

If you want back the previous behavior, you can define your own
function that is the value of revert-buffer-restore-functions (e.g.,
set it to nil).

> I bind this command to F5, so the key reverts, as on Windows:
> 
> (defun revert-buffer-no-confirm ()
>   "Revert buffer without confirmation."
>   (interactive) (revert-buffer t t))
> 
> Useless now.

You can change that trivially to restore the behavior you expect.

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Date: Tue, 29 Apr 2025 09:22:29 +0300
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To: Drew Adams <drew.adams@HIDDEN>
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Subject: Re: bug#78124: 30.1; `revert-buffer' regression
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tags 78124 notabug
thanks

> Date: Mon, 28 Apr 2025 23:20:37 +0000
> From:  Drew Adams via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@HIDDEN>
> 
> I didn't find anything about this in NEWS, so I'm assuming this change
> in behavior isn't intended.  And I HOPE it's not intended.
> 
> emacs -Q
> 
> Visit any file, say foo.el.
> 
> Use `C-x C-q' to make the buffer read-only.
> 
> M-: (revert-buffer t t)
> 
> The buffer should be changed back to writable, but it remains
> read-only.  This is not the case in any prior Emacs release.

This is a (new) feature.  The behavior change was in Emacs 29, where
we have this in NEWS:

  ** Explicitly-set read-only state is preserved when reverting a buffer.
  If you use the 'C-x C-q' command to change the read-only state of the
  buffer and then revert it, Emacs would previously use the file
  permission bits to determine whether the buffer should be read-only
  after reverting the buffer.  Emacs now remembers the decision made in
  'C-x C-q'.

The change was (briefly) discussed in bug#35166.

If you want back the previous behavior, you can define your own
function that is the value of revert-buffer-restore-functions (e.g.,
set it to nil).

> I bind this command to F5, so the key reverts, as on Windows:
> 
> (defun revert-buffer-no-confirm ()
>   "Revert buffer without confirmation."
>   (interactive) (revert-buffer t t))
> 
> Useless now.

You can change that trivially to restore the behavior you expect.

Last modified: Tue, 29 Apr 2025 06:30:02 UTC

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