GNU bug report logs - #34529
C-x b became unusable (ido, recentf, tramp)

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Felicián Németh
 <felician.nemeth <at> gmail.com>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#34529: closed (C-x b became unusable (ido, recentf, tramp))
Date: Thu, 21 Feb 2019 08:13:01 +0000

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Your message dated Thu, 21 Feb 2019 09:12:16 +0100
with message-id <CAGLaV2btKyKZ2Ob7ZFFSd4nx6+MSvbpcJfVGe-L5Q3MFV4Ej4g <at> mail.gmail.com>
and subject line Re: bug#34529: C-x b became unusable (ido, recentf, tramp)
has caused the debbugs.gnu.org bug report #34529,
regarding C-x b became unusable (ido, recentf, tramp)
to be marked as done.

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help-debbugs <at> gnu.org.)


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From: Felicián Németh <felician.nemeth <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: C-x b became unusable (ido, recentf, tramp)
Date: Mon, 18 Feb 2019 17:58:22 +0100

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I had a problem, which can be reproduced to some extent with the
following snippet.  (emacs -Q -l /tmp/bug.el)

   (require 'recentf)
   (setq recentf-save-file "/tmp/bug-recentf")
   (setq recentf-list '("/ssh:localhost#2222:~/a.txt"))
   (setq ido-use-virtual-buffers t)
   (setq ido-save-directory-list-file "/tmp/bug-ido.last")
   (recentf-save-list)
   (ido-mode t)
   (ido-switch-buffer) ; Simulating C-x b

However, that doesn't explain how that entry ended up in my
recentf-save-file.  I'm guessing I opened many tramp files in a
virtual machine, and after I had halted the virtual machine,
emacs wanted to convert the file names to absolute paths.
Strangely,
(get-file-buffer "/ssh:localhost#2222:~/a.txt") and
(expand-file-name "/ssh:localhost#2222:~/a.txt") fail, but
evaluating them the second time, they succeed,  but
expand-file-name returns a wrong value, i.e,

(expand-file-name "/ssh:localhost#2222:~/a.txt")
   =>  error
(expand-file-name "/ssh:localhost#2222:~/a.txt")
   =>  "/ssh:localhost#2222:~/a.txt"

"emacs -Q -l /tmp/bug.el" reproduces the problem with version
25.1.1 and a recent 27.0.50 as well, but I think it was former
who originally wrote the problematic entry into the
recent-save-file.

Thank you.

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From: Felicián Németh <felician.nemeth <at> gmail.com>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: 34529-done <at> debbugs.gnu.org
Subject: Re: bug#34529: C-x b became unusable (ido, recentf, tramp)
Date: Thu, 21 Feb 2019 09:12:16 +0100

Hi Michael,

> The problem seems to be rather ido. Could you pls check bug#24980? It
> sounds similar to your problem, and it was solved in Emacs 26.1. Btw,
> which Emacs version are you running?

I bumped into the problem with Emacs 25.1, but I verified git head
misbehaves with the part of the problem that I understood in my original
report.  However, I forgot to check my recipe to insert a relative path
into recentf-save-file is still valid for the latest Emacs.  It is not,
so I close this report.

Sorry for wasting your time,
Felicián

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