[Webkit-unassigned] [Bug 198557] New: Remove all -2 values for NoButton in favor of an optional type

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=198557

            Bug ID: 198557
           Summary: Remove all -2 values for NoButton in favor of an
                    optional type
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: UI Events
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: graouts at apple.com

This is a follow-up task to https://bugs.webkit.org/show_bug.cgi?id=198462. We use magic -2 values in a bunch of places to identify that no button was pressed for mouse events. We should instead use an optional type.

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