Quoth Damien Cassou on Mar 23 at 12:29 pm:
> [PATCH 1/2] emacs: Add notmuch-combine-face-text-property-string
> [PATCH 2/2] emacs: possibility to customize the rendering of tags
> 
> These patches are the first of an upcoming series whose goal is to
> integrate notmuch-labeler into notmuch. See the following for more
> details: https://github.com/DamienCassou/notmuch-labeler
> 
> - These patches depend on
> id:1360013822-6562-1-git-send-email-amdragon@mit.edu
> "notmuch-combine-face-text-property improvements" by Austin Clements.

BTW, it looks like my notmuch-combine-face-text-property patch hasn't
been pushed yet.