Merge pull request #7933 from asutherland/email-pending-toaster-fix

Bug 837357 - [email/UI] Pending/deferred banner/toaster notifications for message deletion and moves are not displayed on transition back to message list from message reader. r=steveck-chung(cherry picked from commit d50061aa26df2c0b3fd35001bc17fcbde35311ef)
Merge pull request #8078 from asutherland/email-pending-toaster-fix-v1

Bug 837357 - [email/UI] Pending/deferred banner/toaster notifications for message deletion and moves are not displayed on transition back to message list from message reader. r=steveck-chung (cherry picked from commit d50061aa26df2c0b3fd35001bc17fcbde3531