Re: [whatwg/dom] event.composedPath() may return different results if DOM is modified between two calls (#525)

Initially I thought this would be fine but there's a challenge here. Just remembering to which tree each node belongs is not enough because a shadow host could move from one tree to another during an event dispatching. It would mean that we have to compute the relationships between each shadow tree & document tree before the events get dispatched. This is going to be quite expensive since you'd have to remember to which shadow/document tree each node belongs as well as what the shadow tree's parent tree was. That's not the kind of a thing we'd like to implement in WebKit. As such I'm against making this spec change.

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