[Bug 139987] bzr send should retrieve mail-to address from submit branch

[Martin Pool]

> How useful is it to retrieve the mail-to address from the local branch
> rather than the submit branch? If it's not, would it be ok to no longer
> support ``submit_to' set in the local branch?
>
> I think looking at both the local and the submit branch is confusing
> because for the local branch ``submit_to'' means "where to send changes
> made in this branch" while for the submit branch it means "where to send
> changes that should be merged into this branch".
>
> The latter is much more useful because it's always the same address for
> a particular branch - it allows the maintainer of the submit branch to
> tell at which address they would like to receive merge requests.

I agree that we should probably normally be sending to the advertised
address of the branch you're trying to merge into.

-- 
Martin