This change addresses a few issues that existed due to multiple comments
in an editing state at the same time.
1) Fixes issue where if you create two replies and add text to the
second reply, then delete the first one, the text in the second textarea
gets removed.
2) Fixes issue where if you reply and add text, then reply again with
the first draft still editing, the second draft gets populated with the
message from the first comment.
3) Fixes issue where if you have multiple replies and delete one of
them, local storage gets erased. This change sets local storage to the
value of the first editing message found after deleting the other one
(if it exists).
Bug: Issue 4409
Change-Id: Ib5913a34a79783a4a87b4a298e25b02fc587b8dd
43c5ed8045