Previously, opening the reply dialog was disabled when draft comments
were pending save. Now, the reply dialog is fully enabled, and will
silently wait for pending comments to be saved before proceeding with
any save/send operations.
Moreover, when diff drafts are in the process of saving, a label is
displayed below the comments list. When they finish saving, the list is
updated with the diff comments.
Change-Id: I2777f9e15b052e606aa210b5372dc7a89a076345
6873549786