[Webkit-unassigned] [Bug 155746] New: Wheel events' latching state is not reset when appropriated

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=155746

            Bug ID: 155746
           Summary: Wheel events' latching state is not reset when
                    appropriated
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Event Handling
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: tonikitoo at webkit.org

(With latest Safari nightly:)

1) Load http://jsbin.com/sizosozexa/edit?html,output
   (note two listbox'es (<select>s) in the rightmost frame) 
2) Try to alternate scrolling between both listbox'es with wheel events (with two fingers scroll / trackpad)

Expected:
- The listbox scrolled is the one underneath the mouse cursor.

Actual:
- It happens sometimes that the wheel events latching logic, sticks with a given listbox as ScrollableContainer, regardless of where the cursor is when user starts scrolling (with two fingers scroll / trackpad).

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