Bug 800402 - [email] UI: Show the number of unread messages in the message-list header after the folder name

whitespace nit: Don't alter whitespace in functions your patch doesn't end up touching.  I presume this is just an accidental side-effect of some earlier experiments in your code, but it's good to go through and clean these things up before submitting a review request.

I feel like git might actually have some built-in mechanism to help with this

NB: If there is a file or files where you think the whitespace could use a lot of improvement, it's best to provide the whitespace fixes in a separate commit and/or pull request.  That way it's clear to the reviewer what is intentional and what is accidental.  (Of course, in general the nominal code maintainer/owner for a file can play a bit more fast-and-loose with this since it's their aesthetic call.)