Fixed hover events in Shadow DOM #6021
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Fixes #5277
Reverts #5256
The 'target' property changes when bubbling out of Shadow DOM. Unfortunately, that conflicts with event throttling, as the 'target' changes before the throttler's setTimeout calls the hover callback. I added code that captures the original target and passes it to the hover callback.
I'm reverting a previous commit because composedPath isn't needed when the event target is read before the event bubbles outside the shadow root.