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Subject: bug#77678: 31.0.50; Infloop in multi-isearch-read-files
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Hello,

depending on the user's settings and environment it is possible that
`multi-isearch-read-files' never terminates because the `string-equal'
test used to compare file names compares expanded and not expanded
names.  This test succeeding is required for the loop to stop.

We should use a more sensible method similar to other places we recently
changed.

Michael.


In GNU Emacs 31.0.50 (build 66, x86_64-pc-linux-gnu, cairo version
 1.16.0) of 2025-04-09 built on drachen
Repository revision: 8ec63b7b102290377a9958be7a5d7996069dd5ff
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12101007
System Description: Debian GNU/Linux 12 (bookworm)

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Michael Heerdegen <michael_heerdegen@HIDDEN>
Subject: bug#77678: Acknowledgement (31.0.50; Infloop in multi-isearch-read-files)
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Subject: bug#77678: 31.0.50; Infloop in multi-isearch-read-files
Resent-From: Eli Zaretskii <eliz@HIDDEN>
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To: Michael Heerdegen <michael_heerdegen@HIDDEN>
Cc: 77678 <at> debbugs.gnu.org
Date: Wed, 09 Apr 2025 16:02:01 +0300
Message-Id: <868qo9sd2u.fsf@HIDDEN>
From: Eli Zaretskii <eliz@HIDDEN>
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> Date: Wed, 09 Apr 2025 13:03:00 +0200
> From:  Michael Heerdegen via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@HIDDEN>
> 
> depending on the user's settings and environment it is possible that
> `multi-isearch-read-files' never terminates because the `string-equal'
> test used to compare file names compares expanded and not expanded
> names.  This test succeeding is required for the loop to stop.
> 
> We should use a more sensible method similar to other places we recently
> changed.

What method did you have in mind?

Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#77678: 31.0.50; Infloop in multi-isearch-read-files
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Eli Zaretskii <eliz@HIDDEN> writes:

> What method did you have in mind?

`expand-file-name' both arguments?  I dunno whether this suffices when
Tramp comes into play, though.


Michael.

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> From: Michael Heerdegen <michael_heerdegen@HIDDEN>
> Cc: 77678 <at> debbugs.gnu.org
> Date: Wed, 09 Apr 2025 15:13:20 +0200
> 
> Eli Zaretskii <eliz@HIDDEN> writes:
> 
> > What method did you have in mind?
> 
> `expand-file-name' both arguments?  I dunno whether this suffices when
> Tramp comes into play, though.

expand-file-name is a good starting point, yes.  If that's not enough,
then comparing the results with file-equal-p should do.  (If even that
doesn't work in all cases, there's probably more here than meets the
eye.)

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Date: Wed, 09 Apr 2025 18:42:38 +0200
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Eli Zaretskii <eliz@HIDDEN> writes:

Hi,

>> Eli Zaretskii <eliz@HIDDEN> writes:
>>
>> > What method did you have in mind?
>>
>> `expand-file-name' both arguments?  I dunno whether this suffices when
>> Tramp comes into play, though.
>
> expand-file-name is a good starting point, yes.  If that's not enough,
> then comparing the results with file-equal-p should do.  (If even that
> doesn't work in all cases, there's probably more here than meets the
> eye.)

file-equal-p uses file-truename which should be OK. Also from the Tramp PO=
V.

Best regards, Michael.

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>> > What method did you have in mind?
>> 
>> `expand-file-name' both arguments?  I dunno whether this suffices when
>> Tramp comes into play, though.
>
> expand-file-name is a good starting point, yes.  If that's not enough,
> then comparing the results with file-equal-p should do.  (If even that
> doesn't work in all cases, there's probably more here than meets the
> eye.)

What does 'read-file-name' return after immediate RET?  From the docstring:

  Read a file name, prompting with PROMPT and completing in directory DIR.
  Retrun the file name as a string.
  The return value is not expanded---you must call expand-file-name
  yourself.

BTW, there is a typo: "Retrun" (not checked if it exists in emacs-30).

Does this return value logic work with all completion frameworks?

Last modified: Wed, 9 Apr 2025 17:00:03 UTC

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