GNU logs - #42521, boring messages

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Subject: bug#42521: 28.0.50; Can't include an image in a display string
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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

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Dmitry Gutov <dgutov@HIDDEN>
Subject: bug#42521: Acknowledgement (28.0.50; Can't include an image in a
 display string)
Message-ID: <handler.42521.B.159561961419151.ack <at> debbugs.gnu.org>
References: <0ee06a27-b6e9-e381-64e4-51806c403509@HIDDEN>
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Date: Fri, 24 Jul 2020 19:41:02 +0000

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Subject: bug#42521: 28.0.50; Can't include an image in a display string
Resent-From: Eli Zaretskii <eliz@HIDDEN>
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Date: Sat, 25 Jul 2020 08:54:48 +0300
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From: Eli Zaretskii <eliz@HIDDEN>
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 Dmitry Gutov on Fri, 24 Jul 2020 22:40:02 +0300)
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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.

Message received at control <at> debbugs.gnu.org:

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Date: Sat, 25 Jul 2020 08:54:48 +0300
Message-Id: <83blk4dtqv.fsf@HIDDEN>
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.

Last modified: Sat, 25 Jul 2020 06:00:02 UTC

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