[Webkit-unassigned] [Bug 202548] New: FontFaceSet's ready promise is not always resolved

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=202548

            Bug ID: 202548
           Summary: FontFaceSet's ready promise is not always resolved
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Text
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mmaxfield at apple.com
                CC: mmaxfield at apple.com

When we do layout on an element, FontRanges::glyphDataForCharacter() will cause the first available font to start loading, but will continue looking at subsequent fonts to see if there's a good one we can render while the load is happening. When looking for a fallback font, it calls FontRanges::Range::font() with a ExternalResourceDownloadPolicy set to Forbid. This is fine, except that a side effect of calling this function is that the CSSFontFace marks itself as Loading, which means document.fonts.ready is deferred. Then, the load finishes, and the subsequent CSSFontFace is never actually used, meaning it never exits the Loading state, which means document.fonts.ready never fires.

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