[Webkit-unassigned] [Bug 193390] New: Why is the result of FontCascadeFonts::glyphDataForSystemFallback() not kept in the cache?

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=193390

            Bug ID: 193390
           Summary: Why is the result of
                    FontCascadeFonts::glyphDataForSystemFallback() not
                    kept in the cache?
           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: simon.fraser at apple.com
                CC: mmaxfield at apple.com

When running this subtest of Speedometer2: https://browserbench.org/Speedometer2.0/?suite=BackboneJS-TodoMVC&iterationCount=100
we enter FontCascadeFonts::glyphDataForSystemFallback() multiple times, each time for the same glyph (❯ Heavy Right-Pointing Angle Quotation Mark Ornament).

The caller, FontCascadeFonts::glyphDataForCharacter(), puts the resulting glyph in the cache, but later on we go through glyphDataForSystemFallback() again and I'm not sure why.

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