Re: [selection-api] Define the visually equivalency. (#6)

I would like to omit visually equivalency from containsNode. Selection.containsNode() should work on DOM tree and Flat tree.

CSSOM should have rectangle or quad based node containment predicate.
Visual based containment on Selection can write as:

// methods are hypothetical 
const nodeQuad = node.getClientQuad()
for (const range : selection.ranges) {
  const rangeQuad = range.getClientQuad();
  if (rangeQuad.intersects(nodeQuad))
   return true;
}
return false;


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