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bug#41645: 27.0.91; Combining Grapheme Joiner (#x34f) gui artifacts
From: |
Eli Zaretskii |
Subject: |
bug#41645: 27.0.91; Combining Grapheme Joiner (#x34f) gui artifacts |
Date: |
Wed, 03 Jun 2020 18:58:28 +0300 |
> From: Pip Cet <pipcet@gmail.com>
> Cc: dfussner@googlemail.com, 41645@debbugs.gnu.org
> Date: Wed, 03 Jun 2020 14:58:07 +0000
>
> > I'm not sure I follow. What do you mean by "reject"? I thought the
> > code which ignores the metric and sets the font_not_found_p flag when
> > we get a zero-width glyph is a kind of "rejection".
>
> I mean "treat the glyph as non-existent". Currently, for (3), glyphs
> with lbearing but no pixel width are treated as valid and expanded to
> cover a single pixel, which is all but invisible on my screen.
They are hard to spot, but if one looks close enough, IME they are
visible.
We could perhaps introduce a feature whereby such thin-space glyphs
are somehow made to stand out more, but that would be a separate
feature, because right now we have these 1-pixel thin spaces with many
control characters.
> > If you disable auto-composition-mode, and use the
> > fonts which shows CGJ as zero-width glyph, do you still see display
> > artifacts?
>
> No.
Then I think your suggestion to handle such lgstrings as we do with
simple characters is sufficient to fix situations such as this one.
> > If not, what do you see and why is this kind of
> > 'rejection" not enough?
>
> CGJ is displayed as a black box as wide as a space, which is perfectly
> fine. It's U+301 that's not.
Hmm... how does U+301 enter this picture? What problems do you see
with its display?
- bug#41645: 27.0.91; Combining Grapheme Joiner (#x34f) gui artifacts, (continued)
- bug#41645: 27.0.91; Combining Grapheme Joiner (#x34f) gui artifacts, Eli Zaretskii, 2020/06/02
- bug#41645: 27.0.91; Combining Grapheme Joiner (#x34f) gui artifacts, David Fussner, 2020/06/02
- bug#41645: 27.0.91; Combining Grapheme Joiner (#x34f) gui artifacts, Eli Zaretskii, 2020/06/02
- bug#41645: 27.0.91; Combining Grapheme Joiner (#x34f) gui artifacts, Pip Cet, 2020/06/02
- bug#41645: 27.0.91; Combining Grapheme Joiner (#x34f) gui artifacts, David Fussner, 2020/06/02
- bug#41645: 27.0.91; Combining Grapheme Joiner (#x34f) gui artifacts, Eli Zaretskii, 2020/06/03
- bug#41645: 27.0.91; Combining Grapheme Joiner (#x34f) gui artifacts, Pip Cet, 2020/06/03
- bug#41645: 27.0.91; Combining Grapheme Joiner (#x34f) gui artifacts,
Eli Zaretskii <=
- bug#41645: 27.0.91; Combining Grapheme Joiner (#x34f) gui artifacts, Pip Cet, 2020/06/03
- bug#41645: 27.0.91; Combining Grapheme Joiner (#x34f) gui artifacts, Eli Zaretskii, 2020/06/03
- bug#41645: 27.0.91; Combining Grapheme Joiner (#x34f) gui artifacts, Pip Cet, 2020/06/04
- bug#41645: 27.0.91; Combining Grapheme Joiner (#x34f) gui artifacts, Eli Zaretskii, 2020/06/04
- Message not available
- bug#41645: 27.0.91; Combining Grapheme Joiner (#x34f) gui artifacts, Eli Zaretskii, 2020/06/05
- bug#41645: 27.0.91; Combining Grapheme Joiner (#x34f) gui artifacts, Pip Cet, 2020/06/05
- bug#41645: 27.0.91; Combining Grapheme Joiner (#x34f) gui artifacts, David Fussner, 2020/06/05
- bug#41645: 27.0.91; Combining Grapheme Joiner (#x34f) gui artifacts, Eli Zaretskii, 2020/06/05
- bug#41645: 27.0.91; Combining Grapheme Joiner (#x34f) gui artifacts, Eli Zaretskii, 2020/06/02