[Webkit-unassigned] [Bug 222245] New: [Paint Timing] Return early from contentful paint check when no contentful pixels/characters at all

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=222245

            Bug ID: 222245
           Summary: [Paint Timing] Return early from contentful paint
                    check when no contentful pixels/characters at all
           Product: WebKit
           Version: Other
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: noam at webkit.org
                CC: bfulgham at webkit.org, sabouhallawa at apple.com,
                    simon.fraser at apple.com, zalan at apple.com
            Blocks: 211736

The MotionMark tests captured an edge case that causes expensive contentfulness computations.
See https://browserbench.org/MotionMark1.1/developer.html (Focus/Multiply tests)

This edge case is not plausible in real websites, but happens in this benchmark:
- There are lots of elements, performing rendering-intensive rendering
- There is nothing "contentful" in the page, so "first contenful paint" has to be computed multiple times.


Referenced Bugs:

https://bugs.webkit.org/show_bug.cgi?id=211736
[Bug 211736] Enable paint timing by default
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