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Proposal: Remembering message IDs sent with git send-email

I want to gather some thoughts about this. Say you've written a patch
series and are getting ready to send a -v2. If you set
--in-reply-to=ask, it'll show you a list of emails you've recently sent,
and their subject lines, and ask you to pick one to use the message ID
from. It'll set the In-Reply-To header to your selection.

I'd also like to add a custom header, X-Patch-Supersedes: <message ID>,
with a similar behavior & purpose.