Re: [webcomponents] Event path trimming should only happen for mouseover and mouseout (#330)

An alternative to specify a boolean would be to specify a node at which the propagation stops: e.g. `highestTarget`.  This way, `mouseover` and `mouseout` can supply the common ancestor as `highestTarget` instead.  This feature will be slightly more powerful than what's needed by this use case. Although I'd imagine it could become handy in some cases, I'm not sure if it's worth the complexity.

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