Re: [WICG/webcomponents] Selection APIs for Shadow DOM (#79)

We have struggled to get tinymce to work within a shadowRoot without using an iframe and part of that is that we can't get the selection out from within the shadowRoot this `getComposedRange` just partially solves that since we also need to know the selection direction currently we determine that from comparing the focusNode/anchorNode/focusOffset/anchorOffset properties of the selection.
From my understanding of the proposal the focusNode/anchorNode/focusOffset/anchorOffset will just be set to the `Selection.getRange(0)` that would mean it would always be collapsed or always be in one direction.
Not sure how to solve this maybe have a function similar to `getComposedRange` that takes a set of roots and returns if it's forwards or backwards or that it instead of a StaticRange returns a new type of object that has focusNode/anchorNode/focusOffset/anchorOffset/collapsed properties like a StaticSelection or something.

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