[Webkit-unassigned] [Bug 210618] New: A slow-starting swipe always latches on the root node

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=210618

            Bug ID: 210618
           Summary: A slow-starting swipe always latches on the root node
           Product: WebKit
           Version: Safari Technology Preview
          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

Created attachment 396698

  --> https://bugs.webkit.org/attachment.cgi?id=396698&action=review

testcase

Start a slow swipe over an overflow:scroll, and we'll always latch on the main frame by mistake.

The first event we get has zero deltas, so ScrollingTreeScrollingNode::canScrollWithWheelEvent() returns false for non-root nodes, and true for root nodes. Then we latch on the root node for the rest of the gesture.

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