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diffstat <-> ^diff anchors work within the same attachment or
message while in HTML views which display multiple messages.
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Hopefully this helps people familiarize themselves with
the source code.
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Since we need to handle messages with multiple and duplicate
Message-ID headers, our thread skeleton display must account
for that.
Since we have a "preferred" Message-ID in case of conflicts,
use it as the UUID in an Atom feed so readers do not get
confused by conflicts.
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The first Received: header is believable since it typically
hits the user's mail server and can be treated as relatively
trustworthy. We still show the Date: in per-message (permalink)
views, which may expose users for having incorrect Date:
headers, but all the ISO YYYY-MM-DD dates we display will
match what we see.
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Using update-copyrights from gnulib
While we're at it, use the SPDX identifier for AGPL-3.0+ to
ease mechanical processing.
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This can allow streaming parsers (SAX) to work a little more
efficiently as they can handle/discard all the metadata before
the big content.
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Oops, we must not discard the timezone when parsing dates
for the Atom stream.
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We only need strftime to be locale-independent when generating
dates for email and HTTP headers. Purely numeric dates can
use strftime for ease-of-readability.
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This will allows certain feed readers to render a message thread
as described in <https://www.jwz.org/doc/threading.html>.
Feed readers with knowledge of of RFC 4685 are unknown to us at
this time, but perhaps this will encourage future implementations.
Existing feed readers I've tested (newsbeuter, feed2imap) seem
to ignore these tags gracefully without degradation.
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This will let us stream larger Atom documents bodies without
wasting too much memory and reduce the amount of round-trip
requests needed to get necessary information.
Hopefully clients are using streaming (SAX) parsers, too.
This is the final transition in the core public-inbox
code to allow migrating to a "pull"-based body streaming
scheme which allows a HTTP server to respond appropriately
to backpressure from slow clients.
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