NEW198557
Remove all -2 values for NoButton in favor of an optional type 
https://bugs.webkit.org/show_bug.cgi?id=198557
Summary Remove all -2 values for NoButton in favor of an optional type
Antoine Quint
Reported 2019-06-05 01:44:01 PDT
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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