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bug#39390: 28.0.50; prettify-symbols-mode confuses display when start/en
From: |
Eli Zaretskii |
Subject: |
bug#39390: 28.0.50; prettify-symbols-mode confuses display when start/end faces are different |
Date: |
Sun, 02 Feb 2020 19:18:52 +0200 |
> From: Raphael 'kena' Poss <knz@thaumogen.net>
> Date: Sun, 2 Feb 2020 15:45:46 +0100
>
> (add-hook 'go-mode-hook
> (lambda ()
> (push '("error" . ?⊙) prettify-symbols-alist)
> ;; (push '("err != nil" . "⊙?") prettify-symbols-alist)
> ))
>
> However if I then uncomment the second substitution for "err != nil":
> all hell breaks loose: moving the cursor up and down around a source
> line containing this text will mess up the display of the lines that
> follow in a way that is sometimes irrecoverable.
>
> The display bug is exacerbated (and thus easier to recognize/reproduce)
> when global-hl-line-mode is set.
>
> I have traced this down to substitutions where the font-lock face at the
> beginning and the end of the symbol composition is different:
>
> - replacing "String" is OK, replacing ".String()" is not
> - replacing "func" is OK, replacing "func(" is not
> - replacing "Fatal" is OK, replacing "t.Fatal" is not
>
> This probably needs to be fixed somehow, either by preventing the
> problem or by documenting the pitfall.
>
> I would like to know if a workaround is available?
You've bumped into a fundamental limitation of the feature, called
"character composition", that prettify-symbols-mode piggy-backs to do
its thing: Emacs can only compose characters that all have the same
face. This restriction is imposed on a very low level of the display
code.
So I don't think there can be a workaround, except by "fixing" the
font-lock faces to use the same face on all the characters you want to
substitute.
- bug#39390: 28.0.50; prettify-symbols-mode confuses display when start/end faces are different, Raphael 'kena' Poss, 2020/02/02
- bug#39390: 28.0.50; prettify-symbols-mode confuses display when start/end faces are different,
Eli Zaretskii <=
- bug#39390: 28.0.50; prettify-symbols-mode confuses display when start/end faces are different, Raphael 'kena' Poss, 2020/02/02
- bug#39390: 28.0.50; prettify-symbols-mode confuses display when start/end faces are different, Eli Zaretskii, 2020/02/02
- bug#39390: 28.0.50; prettify-symbols-mode confuses display when start/end faces are different, Raphael 'kena' Poss, 2020/02/02
- bug#39390: 28.0.50; prettify-symbols-mode confuses display when start/end faces are different, Eli Zaretskii, 2020/02/02
- bug#39390: 28.0.50; prettify-symbols-mode confuses display when start/end faces are different, Raphael 'kena' Poss, 2020/02/02
- bug#39390: 28.0.50; prettify-symbols-mode confuses display when start/end faces are different, Eli Zaretskii, 2020/02/02
- bug#39390: 28.0.50; prettify-symbols-mode confuses display when start/end faces are different, Raphael 'kena' Poss, 2020/02/02
- bug#39390: 28.0.50; prettify-symbols-mode confuses display when start/end faces are different, Eli Zaretskii, 2020/02/03
- bug#39390: 28.0.50; prettify-symbols-mode confuses display when start/end faces are different, Raphael 'kena' Poss, 2020/02/04
- bug#39390: 28.0.50; prettify-symbols-mode confuses display when start/end faces are different, Eli Zaretskii, 2020/02/16