Re: [w3c/selection-api] Clarify association between a selection and its range (#2)

Current spec states:
"Each selection can be associated with a single range. When there is no range associated with the selection, the selection is empty. The selection must be initially empty."
but per w3c/webcomponents#79, selection should be associated with a composition range so that
selection can represent range-over-shadow and calling SetBaseAndExtent with shadow nodes sets such selection simply w/o any adjustment.

Concerns.
Selection is associated with DOM Range, witch adjusts itself when DOM tree changes but a composition range might not or it is not speced.
getRangeAt() needs some adjustment to return DOM Range from the composition range.

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