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term: append zero-width grapheme breaking characters to previous cell

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When compiled with grapheme clustering support, zero-width characters
that also are grapheme breaks, were ignored (not stored in the
grid).

When utf8proc says the character is a grapheme break, we try to print
the character to the current cell. But this is only done when width >
0. As a result, zero width grapheme breaks were simply discarded.

This only happens when grapheme clustering is enabled; when disabled,
all zero width characters are appended.

Fix this by also requiring the width to be non-zero when if we should
append the character or not.

Closes #1960
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Daniel Eklöf 2025-02-16 07:25:25 +01:00
parent 4abbaf1345
commit 76503fb86a
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@ -112,11 +112,15 @@
enabled ([#1947][1947]).
* Reflow of the cursor (active + saved) when at the end of the line
with a pending wrap (LCF set) ([#1954][1954]).
* Zero-width characters that also are grapheme breaks (e.g. U+200B,
ZERO WIDTH SPACE) being ignored (discarded and never stored in the
grid) ([#1960][1960]).
[1918]: https://codeberg.org/dnkl/foot/issues/1918
[1929]: https://codeberg.org/dnkl/foot/issues/1929
[1947]: https://codeberg.org/dnkl/foot/issues/1947
[1954]: https://codeberg.org/dnkl/foot/issues/1954
[1960]: https://codeberg.org/dnkl/foot/issues/1960
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