Event API: Fix bug where Press root events were not being cleared #15507
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This PR fixes a bug that we discovered earlier this week. It was hard to pint-point until the recent
invariant
was added to detect duplicate root event types being added (when they've already been added). I tracked the issue down to the fact that we don't always clear the root event types inPress
. Furthermore, I was able to make a regression test that fails before this fix.#15257