[Webkit-unassigned] [Bug 212688] [Win] Some Tibetan characters aren't shown

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=212688

--- Comment #3 from Fujii Hironori <Hironori.Fujii at sony.com> ---
FontCache::systemFallbackForCharacters of FontCacheWin.cpp is
using three steps to choose a fallback font.

1. Try IMLangFontLink::MapFont method
2. If no font found, try meta file method
3. If no font found, try FontLink registry method

For the missing Tibetan characters, IMLangFontLink::MapFont
method returns "Arial Unicode MS" font, but Uniscribe returns
USP_E_SCRIPT_NOT_IN_FONT for the font.

For other Tibetan characters, IMLangFontLink::MapFont method
returns "Microsoft Himalaya" font

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