[Webkit-unassigned] [Bug 118026] New: CSS clip property should not force additional clamping to border box

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=118026

           Summary: CSS clip property should not force additional clamping
                    to border box
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Keywords: BlinkMergeCandidate
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: rniwa at webkit.org
                CC: bdakin at apple.com, simon.fraser at apple.com,
                    thorton at apple.com


Merge https://chromium.googlesource.com/chromium/blink/+/3f848e4438bc0c6da76778a91761d61fcc3bd2e8

For a composited layer computing its bounds, there is a code path that
clamps a layer's cliprect to the corresponding element's border box.
However, this is incorrect, since a CSS clip may have valid bounds that
include things outside the border box. So, that clamping should only occur
if there is an overflow clip.

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