[Webkit-unassigned] [Bug 247987] Regression: "font-optical-sizing: auto" has no effect in Safari 16 on macOS Ventura & iOS 16

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=247987

--- Comment #15 from Myles C. Maxfield <mmaxfield at apple.com> ---
Sites that need to be fixed up:

- SystemFontDatabaseCoreText
  - createSystemUIFont()
  - createFontByApplyingWeightWidthItalicsAndFallbackBehavior()
- createFontForInstalledFonts()
- fontWithFamilySpecialCase()
- platformFontLookupWithFamily() (which could benefit from an enum)
- lookupFallbackFont()
- FontFamilySpecificationCoreText::fontRanges()
- FontCustomPlatformData::fontPlatformData()

Hiccups:
- CTFontCreateUIFontForLanguage() returns a font, not a font descriptor
- CTFontCreateForCharactersWithLanguageAndOption() returns a font, not a font descriptor

In order to avoid creating a bunch of derived CTFontDescriptors, I think I'm going to make a new type name, maybe PartialFontDescriptor, and have it be typedefed to CFMutableDictionary or something. That way, a bunch of functions can collaborate on building it, then at the end it can be turned into a font descriptor. Maybe that won't work in practice, but I'd like to try to do it.

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