[Webkit-unassigned] [Bug 262078] New: [mac] WebDriver sometimes taking screenshots with transparent grey line at the top and no rounded corners

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=262078

            Bug ID: 262078
           Summary: [mac] WebDriver sometimes taking screenshots with
                    transparent grey line at the top and no rounded
                    corners
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: gsnedders at apple.com
                CC: webkit-bug-importer at group.apple.com

see, e.g., https://wpt.fyi/results/css/css-contain?q=%28label%3Ainterop-2022-contain%20or%20label%3Ainterop-2023-contain%29%20is%3Adifferent&run_id=5179945829007360&run_id=5129256222326784&run_id=5105446492307456

e.g. https://wpt.fyi/analyzer?screenshot=sha1%3Aa8193aa1d36a2e7c269c79da3fdfef70d986dd6d&screenshot=sha1%3A1bc22df9e9199ea9890c7d35fbf48b11b87cf11b or https://wpt.fyi/analyzer?screenshot=sha1%3A8d5e20aecf8b5cc808f48b90c8ee7e09f88d3c38&screenshot=sha1%3Abc778655cc0444e393609feb97a0948c43475817

We seem to end up with a transparent grey overlay at the top (the shadow from the tab bar?), one pixel high. What's more odd given that is we also are lacking the rounded corners we'd expect from the window, which extends for more than a single pixel—so we aren't just cropping the screenshot of the window off-by-one-pixel, we have some larger difference here.

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