[Webkit-unassigned] [Bug 153398] New: ScrollAnimator is not notified when mouse entered, moved or exited a RenderListBox

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=153398

            Bug ID: 153398
           Summary: ScrollAnimator is not notified when mouse entered,
                    moved or exited a RenderListBox
    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

EvenHandler is checking whether the enclosing layer of a node is registered as scrollable area of its frame view. That doesn't work for list boxes, because they are the scrollable area themselves. Also when entering a list box the node under mouse it not usually the list box itself, but any of its children, a HTMLOptionElement or a HTMLOptGroupElement. Instead of comparing layers, we should find the enclosing scrollable area of the target elements and compare them to decide whether the mouse has entered, left or moved a scrollable area.

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