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[debbugs-tracker] bug#34771: closed (27.0.50; object is a window sometim

From: GNU bug Tracking System
Subject: [debbugs-tracker] bug#34771: closed (27.0.50; object is a window sometimes although it should be a buffer in conditional display spec)
Date: Thu, 07 Mar 2019 20:11:03 +0000

Your message dated Thu, 07 Mar 2019 22:09:37 +0200
with message-id <address@hidden>
and subject line Re: bug#34771: 27.0.50; object is a window sometimes although 
it should be a buffer in conditional display spec
has caused the debbugs.gnu.org bug report #34771,
regarding 27.0.50; object is a window sometimes although it should be a buffer 
in conditional display spec
to be marked as done.

(If you believe you have received this mail in error, please contact

34771: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=34771
GNU Bug Tracking System
Contact address@hidden with problems
--- Begin Message --- Subject: 27.0.50; object is a window sometimes although it should be a buffer in conditional display spec Date: Wed, 06 Mar 2019 18:42:19 +0100 User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux)
The docs state:

,----[ (info "(elisp)Other Display Specs") ]
|    You can make any display specification conditional.  To do that,
| package it in another list of the form ‘(when CONDITION . SPEC)’.  Then
| the specification SPEC applies only when CONDITION evaluates to a
| non-‘nil’ value.  During the evaluation, ‘object’ is bound to the string
| or buffer having the conditional ‘display’ property.  ‘position’ and
| ‘buffer-position’ are bound to the position within ‘object’ and the
| buffer position where the ‘display’ property was found, respectively.
| Both positions can be different when ‘object’ is a string.

So in a conditional display spec, object should always be a buffer.
However, that doesn't seem to be the reality.  Sometimes, it is also a

Here's a recipe for the current master:

$ emacs -q

In *scratch* insert and evaluate:

(insert (propertize "foobar" 'display
                    `(when (get-buffer-window object)
                       . ,(format "%s" (random)))) "\n")

Now move point over the displayed random number, hit and hold C-l, or
do whatever triggers redisplay.

Now I have this in *Messages*:

Error during redisplay: (eval (get-buffer-window object)) signaled 
(wrong-type-argument stringp #<window 3 on *scratch*>) [33 times]

In GNU Emacs 27.0.50 (build 8, x86_64-pc-linux-gnu, GTK+ Version 3.24.5)
 of 2019-03-06 built on thinkpad-t440p
Repository revision: 2260e48d2eeaa9ea2b9c17389cc25d00f85c414c
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12004000
System Description: Arch Linux

Recent messages:
20190306T182620.294> nnimap read 0k from imap.fastmail.com
20190306T182623.263> Exiting summary buffer and applying spam rules
20190306T182623.788> Expiring articles...
20190306T182624.202> Expiring articles...done
20190306T182625.333> Saving Gnus registry (9449 entries) to 
20190306T182626.824> Saving Gnus registry (size 9449) to 
20190306T182626.828> Saving /home/horn/.gnus.d/.newsrc.eld...
Saving file /home/horn/.gnus.d/.newsrc.eld...
Wrote /home/horn/.gnus.d/.newsrc.eld
20190306T182626.864> Saving /home/horn/.gnus.d/.newsrc.eld...done

Configured features:

Important settings:
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  value of $LC_NUMERIC: de_DE.utf8
  value of $LC_TIME: de_DE.utf8
  value of $LANG: en_US.utf8
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Major mode: Group

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Load-path shadows:
None found.

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Memory information:
((conses 16 995158 269302)
 (symbols 48 66241 18)
 (strings 32 316037 17771)
 (string-bytes 1 9802325)
 (vectors 16 94279)
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 (buffers 992 32))

--- End Message ---
--- Begin Message --- Subject: Re: bug#34771: 27.0.50; object is a window sometimes although it should be a buffer in conditional display spec Date: Thu, 07 Mar 2019 22:09:37 +0200
> From: Tassilo Horn <address@hidden>
> Cc: address@hidden
> Date: Thu, 07 Mar 2019 17:43:53 +0100
> > I pushed it now, please take a look.
> Yes, it works now.

OK, closing.  Thanks.

--- End Message ---

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