[Bug 1833858] Droid Hangul Jamo is separated and printed respectively

https://bugzilla.redhat.com/show_bug.cgi?id=1833858



--- Comment #23 from Luke Hutchison <luke.hutch(a)gmail.com&gt; ---
PS Droid Sans Fallback is often selected as the sans fallback font by Chrome on
Fedora, and since the droid-sans-fonts package is default on Fedora (or at
least a dependency of many other packages), this font frequently breaks Web
browsing in Korean on Fedora -- so it's a pretty visible bug.

Even within a single sentence, some words (words starting with 가) fall back to
Droid Sans Fallback, and some fall back to Noto Sans CJK. See a depiction of
this pattern here:

https://github.com/harfbuzz/harfbuzz/issues/3003

The reason for this is probably that 가 is the pronunciation of the first jamo
in the Korean alphabet, so it is used when spelling out bullet points etc.
(equivalent to A, B, C, ...), and I'm guessing that Droid Sans Fallback
contains the phonetic spelling of each jamo such as 가. So the fallback decision
is made based on the first character in each word (at least in Google Docs,
which probably calls the font measuring API for each word in a sentence,
triggering a fallback decision for each word).

This indicates that the fallback logic can be improved. Currently the fallback
determination seems to be being made based on the first Unicode codepoint in a
span of text submitted for shaping. Is that a correct assumption?


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