Wyatt Allen 489e2680a7 Show confirmation dialog before destructively discarding draft comments
The discard confirm dialog is added alongside the delete confirm dialog
and the dialog opening/closing code is refactored to work on either. The
confirm discard dialog only appears if the draft message is savable.

Feature: Issue 6984
Change-Id: I6d88a8734fa7736f685796790e02437b10c81f00
2017-10-19 13:11:54 -07:00
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