Eli Zaretskii <eliz@HIDDEN>
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From: Eli Zaretskii <eliz@HIDDEN>
To: Dmitry Gutov <dgutov@HIDDEN>
In-Reply-To: <0ee06a27-b6e9-e381-64e4-51806c403509@HIDDEN> (message from
Dmitry Gutov on Fri, 24 Jul 2020 22:40:02 +0300)
Subject: Re: bug#42521: 28.0.50; Can't include an image in a display string
References: <0ee06a27-b6e9-e381-64e4-51806c403509@HIDDEN>
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severity 42521 wishlist
thanks
> From: Dmitry Gutov <dgutov@HIDDEN>
> Date: Fri, 24 Jul 2020 22:40:02 +0300
>
> (progn
> (erase-buffer)
> (insert " ")
> (setq o (make-overlay (point-min) (point)))
> (overlay-put o 'display
> (concat (propertize " " 'display
> (create-image "splash.svg" nil nil
> :max-height
> (default-font-height)))
> " text after image")))
>
> The script above will end with a blank space instead of an image being
> displayed.
This is a documented limitation of the current design and
implementation of the 'display' property. The ELisp manual says:
‘STRING’
Display STRING instead of the text that has this property.
Recursive display specifications are not supported—STRING’s
‘display’ properties, if any, are not used.
I never looked into lifting this restriction, so I don't know what
would that entail. There are probably some complications with faces,
at least. If someone wants to study the issue, that'd be welcome, I
think.
bug-gnu-emacs@HIDDEN:bug#42521; Package emacs.
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To: bug-gnu-emacs@HIDDEN
Subject: 28.0.50; Can't include an image in a display string
From: Dmitry Gutov <dgutov@HIDDEN>
Message-ID: <0ee06a27-b6e9-e381-64e4-51806c403509@HIDDEN>
Date: Fri, 24 Jul 2020 22:40:02 +0300
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(progn
(erase-buffer)
(insert " ")
(setq o (make-overlay (point-min) (point)))
(overlay-put o 'display
(concat (propertize " " 'display
(create-image "splash.svg" nil nil
:max-height
(default-font-height)))
" text after image")))
The script above will end with a blank space instead of an image being
displayed.
To compare: replace the first 'display symbol with 'after-string, and
the image is displayed.
Why do we need this: if this worked, we would implement icons display in
the default completion popup in company-mode. It's a feature that has
been requested for a while. See the discussion here:
https://github.com/company-mode/company-mode/pull/996#issuecomment-662743347
Unfortunately, as we seem to have concluded in
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=18285
and
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=20847,
I have to use the `display' overlay property in most of the cases.
P.S. This is not a regression, Emacs 26.3 is the same.
In GNU Emacs 28.0.50 (build 25, x86_64-pc-linux-gnu, GTK+ Version
3.24.20, cairo version 1.16.0)
of 2020-07-20 built on potemkin
Repository revision: 4c08c2f45b9bb0265f6d7c3529011dee1b18e843
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12008000
System Description: Ubuntu 20.04 LTS
Dmitry Gutov <dgutov@HIDDEN>:bug-gnu-emacs@HIDDEN.
Full text available.bug-gnu-emacs@HIDDEN:bug#42521; Package emacs.
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