Implement the jwz threading algorithm#3355
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Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>
Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>
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Extracted from #2125 to make the PR more reviewable.
This is basically an implementation of https://www.jwz.org/doc/threading.html but using a few tricks from https://tools.ietf.org/html/rfc5256 like the root container (as opposed to a list of root containers).
The algorithm here doesn't do anything yet, the integration will follow with #2125. All this patch is add the algorithm and a set of tests that ensure some basic cases work as expected. I would say we have to see if and how well it works and take a closer look once we have the real data. On paper it's a bit hard to reason about the correctness. But not crashing is already a good achievement I guess.
For those who really want to dig into it I left comments for the respective sections on https://www.jwz.org/doc/threading.html in each of the sections of the algorithm. On a high level there is one method that builds the threads and that splits the complexity in five private methods for each of the main steps.
Ref https://github.com/nextcloud/mail/projects/11#card-41435877