Some fonts don't have individual glyphs for marks, but have composite glyphs. For example, A font can have a glyph for U+00e9 (e with acute) even if it doesn't have a glyph for U+0301(combining acute accent). We should take into account this fast when we divide a text run into HarfBuzzRuns. If the font also doesn't have composite glyphs, we should try fallback fonts for mark characters.
Created attachment 164660 [details] Patch
Created attachment 164661 [details] Fix typo
Hi tony, Could you take a look?
Comment on attachment 164661 [details] Fix typo OK
Comment on attachment 164661 [details] Fix typo Thank you!
Comment on attachment 164661 [details] Fix typo Clearing flags on attachment: 164661 Committed r129050: <http://trac.webkit.org/changeset/129050>
All reviewed patches have been landed. Closing bug.