Merge pull request #8104 from borjasalguero/bug_visibility_updateHeaders

Bug 841376 - [SMS] Conversation list headers not correctly updated r=fca...(cherry picked from commit a0fb6081a0f0dc4f55e6a08637961dde99549077)
(cherry picked from commit 4337d12611e3743f15c44182052d858fb5f05b24)