Becky Siegel bbde672af0 Update comment thread creation/removal to no longer use locationRange
Follow-up to https://gerrit-review.googlesource.com/c/gerrit/+/157590
which no longer used locationRange to group comments together into
threads. However, locationRange was still used for a few other things
including thread removal, which could result in a bug if there were
two threads that had the same locationRange and the wrong one was
found first.

Things included in this change:
1. Determine whether a thread group exists
   - This is identified as it was before. The thread group now gets a
     commentSide attribute, as it can pass it to all of its children
     (the same for all).
2. Determine if a thread exists within the group for a given range in a
   group
   - The range object is now included as an attribute on the comment
     thread instead of the locationRange string.
3. Be able to remove a thread group
   - A rootId attribute is now stored on the comment thread, which is
     data bound to each comment. When a comment is removed, it finds the
     thread with the rootId within the thread group to remove.
   - In the event that a thread group only contains a single draft,
     there is no roottId.

Change-Id: I4f7804ac02f4259b4964c6333d258f0fc3b29d24
2018-02-12 17:36:33 -08:00

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