Be more careful with the start and end boundaries
Be more careful with the start and end boundaries

Don't let the prefix search set the start or end boundary, or it
may cause the result to be incorrect. The prefix search should only
set the location for the next search. The bounds of the result should
only be set based on the search for the actual slices.

tilgovi/dom-anchor-text-quote,hypothesis/dom-anchor-text-quote