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Subject: bug#70326: 30.0.50; Backup Files documentation does not match observed behaviour
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In 19.3.2 Backup Files, we read:

   "Emacs makes a backup for a file only the first time the file is saved
    from a buffer."

However, when I launch Emacs with:

    $ emacs -Q

and then do:

    C-x C-w backup.txt RET

then the file is saved from the buffer as expected, and Emacs tells me:

    "Wrote .../backup.txt"

However, even though this is the first time the file is saved from a
buffer, no backup for a file is created, and buffer-backed-up is nil.

If possible, could you please consider rephrasing the documentation so
that it accurately describes the cases where a backup file is created,
or alternatively adapt the behaviour so that it matches the current
documentation?

Thank you and all the best,
Markus

In GNU Emacs 30.0.50 (build 1, x86_64-apple-darwin18.2.0, X toolkit,
 cairo version 1.17.6, Xaw scroll bars) of 2023-09-11 built on
 mac
Windowing system distributor 'The X.Org Foundation', version 11.0.12011000
System Description:  Mac OS X 10.14.2

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Markus Triska <triska@HIDDEN>
Subject: bug#70326: Acknowledgement (30.0.50; Backup Files documentation
 does not match observed behaviour)
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Subject: bug#70326: 30.0.50; Backup Files documentation does not match observed behaviour
Resent-From: Eli Zaretskii <eliz@HIDDEN>
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Date: Wed, 10 Apr 2024 21:28:47 +0300
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From: Eli Zaretskii <eliz@HIDDEN>
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tags 70326 notabug
thanks

> From: Markus Triska <triska@HIDDEN>
> Date: Wed, 10 Apr 2024 20:24:53 +0200
> 
> In 19.3.2 Backup Files, we read:
> 
>    "Emacs makes a backup for a file only the first time the file is saved
>     from a buffer."
> 
> However, when I launch Emacs with:
> 
>     $ emacs -Q
> 
> and then do:
> 
>     C-x C-w backup.txt RET

"C-x C-w" is not "saving the file from a buffer".  "C-h c" says that
"C-x C-w runs the command write-file".  So I don't see anything wrong
with what the manual says.

Message received at control <at> debbugs.gnu.org:

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Date: Wed, 10 Apr 2024 21:28:47 +0300
Message-Id: <86h6g9ul5s.fsf@HIDDEN>
From: Eli Zaretskii <eliz@HIDDEN>
To: Markus Triska <triska@HIDDEN>
In-Reply-To: <m2frvtf53e.fsf@HIDDEN> (message from Markus Triska on Wed, 
 10 Apr 2024 20:24:53 +0200)
Subject: Re: bug#70326: 30.0.50;
 Backup Files documentation does not match observed behaviour
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tags 70326 notabug
thanks

> From: Markus Triska <triska@HIDDEN>
> Date: Wed, 10 Apr 2024 20:24:53 +0200
> 
> In 19.3.2 Backup Files, we read:
> 
>    "Emacs makes a backup for a file only the first time the file is saved
>     from a buffer."
> 
> However, when I launch Emacs with:
> 
>     $ emacs -Q
> 
> and then do:
> 
>     C-x C-w backup.txt RET

"C-x C-w" is not "saving the file from a buffer".  "C-h c" says that
"C-x C-w runs the command write-file".  So I don't see anything wrong
with what the manual says.

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Subject: bug#70326: 30.0.50; Backup Files documentation does not match observed behaviour
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 Content preview: Eli Zaretskii <eliz@HIDDEN> writes: > "C-x C-w" is not
 "saving
 the file from a buffer". "C-h c" says that > "C-x C-w runs the command
 write-file".
 So I don't see anything wrong > with what the manual says. 
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Eli Zaretskii <eliz@HIDDEN> writes:

> "C-x C-w" is not "saving the file from a buffer".  "C-h c" says that
> "C-x C-w runs the command write-file".  So I don't see anything wrong
> with what the manual says.

To reproduce the issue, you can also type a letter and then use C-x C-s
(i.e., save-buffer), and observe the same effect: A backup file is not
created, even though a file is saved for the first time from a buffer.

All the best,
Markus

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