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fix(mbyte): mark any 0xFE0F sequence as a TUI ambiguous width char

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Some sequences beginning with ASCII might be rendered as emoji, as for
instance emoji 1️⃣  which is encoded as ascii 0x31 + U+FE0F + U+20E3.

While it is tricky to make the width of such sequences configurable,
we can make TUI be careful with such sequences and reset the cursor,
just like for Extended_Pictogram based sequences.
This commit is contained in:
bfredl 2024-09-02 12:00:19 +02:00
parent 97f8d1de1c
commit 50a576ba57
1 changed files with 13 additions and 4 deletions
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17
src/nvim/mbyte.c
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@ -1339,13 +1339,22 @@ int utf_class_tab(const int c, const uint64_t *const chartab)
bool utf_ambiguous_width(const char *p)
{
int c = utf_ptr2char(p);
if (c < 0x80) {
// be quick if there is nothing to print or ASCII-only
if (p[0] == NUL || p[1] == NUL) {
return false;
}
const utf8proc_property_t *prop = utf8proc_get_property(c);
return prop->ambiguous_width || prop_is_emojilike(prop);
CharInfo info = utf_ptr2CharInfo(p);
if (info.value >= 0x80) {
const utf8proc_property_t *prop = utf8proc_get_property(info.value);
if (prop->ambiguous_width || prop_is_emojilike(prop)) {
return true;
}
}
// check if second sequence is 0xFE0F VS-16 which can turn things into emoji,
// safe with NUL (no second sequence)
return memcmp(p + info.len, "\xef\xb8\x8f", 3) == 0;
}
// Return the folded-case equivalent of "a", which is a UCS-4 character. Uses