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* bug#34771: 27.0.50; object is a window sometimes although it should be a buffer in conditional display spec
@ 2019-03-06 17:42 Tassilo Horn
  2019-03-06 19:08 ` Eli Zaretskii
  0 siblings, 1 reply; 6+ messages in thread
From: Tassilo Horn @ 2019-03-06 17:42 UTC (permalink / raw)
  To: 34771


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
window.

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
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Wrote /home/horn/.gnus.d/.newsrc.eld
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Memory information:
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^ permalink raw reply	[flat|nested] 6+ messages in thread
end of thread, other threads:[~2019-03-07 20:09 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2019-03-06 17:42 bug#34771: 27.0.50; object is a window sometimes although it should be a buffer in conditional display spec Tassilo Horn
2019-03-06 19:08 ` Eli Zaretskii
2019-03-07 10:27   ` Tassilo Horn
2019-03-07 14:57     ` Eli Zaretskii
2019-03-07 16:43       ` Tassilo Horn
2019-03-07 20:09         ` Eli Zaretskii

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