https://bugs.documentfoundation.org/show_bug.cgi?id=124350
--- Comment #8 from Tor Lillqvist <[email protected]> ---
Problem could be related to "break iterators". Debugging the code on macOS and
iOS in parallel, I see a difference in what happens in
GenericSalLayout::SetNeedFallback(). For the string "A🐶", on macOS
nGraphemeStartPos is 1, nGraphemeEndPos is 3. On iOS, they are 0 and 3. Which
matches the difference I see from debug output elsewhere, on macOS the part of
the string with just the emoji is handled separately for glyph fallback, while
on iOS the whole string is, which goes wrong.
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