[Webkit-unassigned] [Bug 243189] New: Evict unused fonts after 4 rendering updates containing paint changes.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=243189

            Bug ID: 243189
           Summary: Evict unused fonts after 4 rendering updates
                    containing paint changes.
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Keywords: InRadar
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mattwoodrow at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    webkit-bug-importer at group.apple.com, zalan at apple.com

<rdar://97346409>


We previously evicted fonts from the resource cache if they hadn't been used
for 4 rendering updates. Many rendering updates don't contain any paint changes,
so always count all fonts as 'unused'.

This changes us to only count rendering updates that contain painting towards
deciding if a font has been unused long enough to be evicted.

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