Patrick Steinhardt [off-list ref] writes:

We're about to extend our documentation to recommend b4 for sending
patch series ot the mailing list. Prepare for this by introducing a b4
configuration so that the tool knows to honor our preferences. For now,
this configuration does two things:

  - It configures "send-same-thread = shallow", which tells b4 to always
    send subsequent versions of the same patch series as a reply to the
    cover letter of the first version.

  - It configures "prep-cover-template", which tells b4 to use a custom
    template for the cover letter. The most important change compared to
    the default template is that our custom template also includes a
    range-diff.

There's potentially more things that we may want to configure going
forward, like for example auto-configuration of folks to Cc on certain
patches. But these two tweaks feel like a good place to start.

Signed-off-by: Patrick Steinhardt <redacted>
---
 .b4-config         |  3 +++
 .b4-cover-template | 11 +++++++++++
 2 files changed, 14 insertions(+)

Shipping a sample like ".b4-config.sample" that users who opt-in can
copy-and-edit into the final name ".b4-config" is OK, but I'd rather
not to ship the configuration files that the users would want to edit
(hence making the tree dirty).