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

forgot to finish the existing mechanism stuff.  So there are definitely options where you convert your patch to a patch and run it through a filter to address things like this.  Or git at least definitely lets you do something like "git stash -i" or some other interactive hunk editing where it asks you if you want to keep the specific hunks in the patch or not.  That works potentially quite well since whitespace unrelated to other changes you're making is definitely going to end up in its own diff hunk.