GNU bug report logs - #39390
28.0.50; prettify-symbols-mode confuses display when start/end faces are different

Previous Next

Full log

View this message in rfc822 format

From: Raphael 'kena' Poss <knz <at> thaumogen.net>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 39390 <at> debbugs.gnu.org
Subject: bug#39390: 28.0.50; prettify-symbols-mode confuses display when start/end faces are different
Date: Sun, 2 Feb 2020 21:00:53 +0100

[Message part 1 (text/plain, inline)]

On 02-02-2020 20:20, Eli Zaretskii wrote:
> The composition process needs that all of the
> characters to be composed have the same face.  That face is put on the
> characters by font-lock mode, not by prettify-symbols-mode. [...]
> Without all the characters to be replaced
> having the same font-lock face, you will not be able to "convince"
> prettify-symbols-mode to replace them

I think this wasn't clear in my original bug report: the replacement
*does* occur -- the display shows the result of the substitution upon
first display. (see first attached screenshot).

It even properly switches back and forth between the composition and
original form with unprettify-at-point. (see second attachment)

The problem is that the *redisplays* (e.g. as triggered by moving the
highlight around with hl-line-mode) mess up the lines around the
replacement. See third and fourth screenshots.

If you are telling me that (compose-region) should never have agreed to
operate on a range of symbols with different faces, then I have
counter-evidence that it does. If you are telling me that it shouldn't,
then maybe that's where the bug really lies.



-- 
Raphael 'kena' Poss

[Screenshot_2020-02-02_20-58-58.png (image/png, attachment)]

[Screenshot_2020-02-02_20-59-18.png (image/png, attachment)]

[Screenshot_2020-02-02_20-59-39.png (image/png, attachment)]

[Screenshot_2020-02-02_20-59-58.png (image/png, attachment)]

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.