The addition of formatting in comments broke a variety of things having
to do with the copying logic. This change updates the logic and tests
to reflect the new DOM.
This issue arose because of a lack of integration tests for copying and
selection. That test is coming in a descendant change.
Bug: Issue 4969
Change-Id: I4e1994ab07947506c77b07877a46a9369d666d50
1ba850e594