Get closest contiguous clickable element for hints to reduce duplicat… #1469
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…e hints
Addresses #1448
SurfingKeys applies hints to any elements if they're clickable and visible. I modified SurfingKeys to find the furthest contiguous ancestor that is clickable. This significantly reduces duplicate hints, and should make it clearer what clickable region each hint actually refers to.
I experimented with deduplicating on the href, but that didn't seem to have much effect, and is excluded from this PR.