[Webkit-unassigned] [Bug 153304] New: Main frame scrollbars not updated on hovering when using overlay scrollbars

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=153304

            Bug ID: 153304
           Summary: Main frame scrollbars not updated on hovering when
                    using overlay scrollbars
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: cgarcia at igalia.com
                CC: bdakin at apple.com, darin at apple.com,
                    simon.fraser at apple.com

Legacy scrollbars were fixed in r194155, but overlay scrollbars are not notified when they are hovered. This is because the layer hit test in RenderView::hitTest always returns true when using overlay scrollbars and we are returning early in such case ignoring the HitTestRequest::AllowFrameScrollbars flag. So, in case of using overlay scrollbars we still need to check the RenderView scrollbars even when the layer hist test succeeded unless it already contains a scrollbar.

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