Bug 1008477 - [email/UI] Virtual list regression; attachment icon only ever gets set never, cleared. Because of DOM node reuse results in misleading attachment icon status.
Merge pull request #19127 from asutherland/email-update-attachment-status

Bug 1008477 - [email/UI] Virtual list regression; attachment icon only ever gets set never, cleared. Because of DOM node reuse results in misleading attachment icon status. r=jrburke