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

>   <li>
> -  <p>For each <var>listener</var> in <var>listeners</var>, whose <b>removed flag</b> is unset, run
> +  <p>If <var>event</var>'s <a>found listener flag</a> is unset, run

This flag is checked as part of "invoke" only, and unset at the end of "invoke". Given that "invoke" is not invoked recursively, how does this work?

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