[Webkit-unassigned] [Bug 89658] New: FontFallbackList should release cached font data when the FontCache is invalidated

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=89658

           Summary: FontFallbackList should release cached font data when
                    the FontCache is invalidated
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: kbalazs at webkit.org
                CC: mitz at webkit.org, jchaffraix at webkit.org,
                    zherczeg at webkit.org, msaboff at apple.com


This has shown in #76534, i.e. the assertion |fontCache()->generation() == m_generation| in FontFallbackList::fontDataAt is failing. This means we hurt the invariant that the FontData* stored in FontFallbackList also exists in the FontCache with it's associated FontPlatformData. I believe the reason why it did not shown up earlier is that FontCache::invalidate is not well tested.

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