Re: [dom] Fixes #156. Add legacy event type check to invoke algorithm. (#168)

> @@ -780,6 +780,7 @@ flags that are all initially unset:
>   <li><dfn export for=Event id=initialized-flag>initialized flag</dfn>
>   <li><dfn export for=Event id=dispatch-flag>dispatch flag</dfn>
>   <li><dfn export for=Event id=in-passive-listener-flag>in passive listener flag</dfn>
> + <li><dfn export for=Event id=found-listener-flag>found listener flag</dfn>

I was thinking, if "inner invoke" / "find" just returns a boolean, we don't need extra state on the event. I think that would be better.

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