[Webkit-unassigned] [Bug 199779] New: Don't do async overflow scrolling for visibility:hidden scrollers

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=199779

            Bug ID: 199779
           Summary: Don't do async overflow scrolling for
                    visibility:hidden scrollers
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Scrolling
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com

If a scroller has visibility:hidden, don't trigger the async overflow scroll code path.

Some JS libraries make visibility:hidden scrollers (https://github.com/wnr/element-resize-detector) and we need to avoid the compositing cost.

I filed https://github.com/w3c/csswg-drafts/issues/4113 on this not being well-defined in CSS, and expect that to be resolved in a way that prevents scrolling.

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