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bug#22795: 25.0.91; Can't write read only file on w32

From: Eli Zaretskii
Subject: bug#22795: 25.0.91; Can't write read only file on w32
Date: Sat, 14 May 2016 12:17:03 +0300

> Date: Tue, 01 Mar 2016 18:27:35 +0200
> From: Eli Zaretskii <address@hidden>
> Cc: address@hidden
> > Date: Mon, 29 Feb 2016 13:34:36 -0800
> > CC: <address@hidden>
> > From: "Ota, Takaaki" <address@hidden>
> > 
> > I just tried again with "run -Q" from gdb and the result is the same.
> > 24.5 never called sys_rename() and 25.0.91 called sys_rename() with
> > two same names.
> What about Frename_file? does 24.5 call it in this scenario?
> If it doesn't, then please look at the beginning of backup-buffer (in
> files.el), make sure it is called in 24.5 in this scenario, and then
> please tell what are the values of real-file-name and backup-info in
> this part at the beginning of backup-buffer:
>       (let* ((real-file-name (file-chase-links buffer-file-name))
>              (backup-info (find-backup-file-name real-file-name)))
> Also, what are the values of make-backup-files, backup-inhibited, and
> buffer-backed-up in the buffer that visits the read-only file?
> Btw, is that file under some kind of version control, per chance?
> And please make sure, from now on, to test everything in "emacs -Q",
> to prevent any customizations from getting in the way of this
> investigation.

Ping!  Can we please continue this investigation?

If the problem is no longer reproducible with the latest pretest
25.0.9x, or if you can no longer afford looking into this, I will most
probably close the bug.


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