[PATCH v3] emacs: Allow part preferences to depend on message content.

[David Bremner]

David Edmondson <dme at dme.org> writes:

> Currently the preference for which sub-part of a multipart/alternative
> part is shown is global. Allow to the user to override the settings on a
> per-message basis by providing the ability to call a function that has
> access to the message to return the discouraged type list.
>
> The original approach is retained as the default.

pushed,

d