Humdinger
3570c2e1b2
To be used by the user to assign a custom label to an email, see
forum thread [1].
It's supposed to replace the mis-use of MAIL:status which should be left
to show the actual status of an email ("New", "Sent", "Replied", etc.).
[1] https://discuss.haiku-os.org/t/introducing-a-new-indexed-attribute-meta-tag
Change-Id: I76f40beeb2c42ab40efa04db3ee3b1b6f77ec926
Reviewed-on: https://review.haiku-os.org/c/haiku/+/10303
Reviewed-by: Adrien Destugues <[email protected]>