Vendor femtovg 0.23.2 with a targeted patch: the swash raster path can
fail to scale some variable fonts at a non-default variation instance
(the CFF2-based CJK system fonts on modern macOS), and femtovg cached
those glyphs as permanently missing — so track titles and any other
text at medium/semibold/bold weight rendered blank for CJK while
regular weight (empty coords) worked. render_glyph now retries the
glyph at the font's default instance before giving up: worst case the
glyph draws at regular weight instead of not at all. Fonts and
instances that already render are untouched.
Fixes#543
cc
vicrodh
3a1c367d1a