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Revert "Note a more efficient computation of the auth difference. (#1119)" (#1132)

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* Revert "Note a more efficient computation of the auth difference. (#1119)"

This reverts commit a707266e50.

* Changelog

* Delete 1132.misc

Co-authored-by: Travis Ralston <travpc@gmail.com>
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David Robertson 2022-06-16 15:21:52 +01:00 • committed by GitHub
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1
changelogs/room_versions/newsfragments/1119.clarification
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@ -1 +0,0 @@
For room version 2 through 10: Note a more efficient way to compute the auth difference during state resolution.

19
content/rooms/fragments/v2-state-res.md
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@ -47,20 +47,13 @@ all of *their* auth events, and so on recursively, stretching back to the
start of the room. Put differently, these are the events reachable by walking
the graph induced by an event's `auth_events` links.
If *S* is a collection of
events, the *full auth chain of S* is the union of the auth chains of every
event *E* in *S*.
**Auth difference.**
For each state *S<sub>i</sub>*, compute its full auth chain.
The *auth difference* is the set of events which belong to some, but not all,
of these full auth chains. In symbols: if *F*(*S*) is the full auth
chain of a collection of events *S*, the auth difference is
∪<sub>*i*</sub> *F*(*S<sub>i</sub>*) - ∩<sub>*i*</sub> *F*(*S<sub>i</sub>*).
This can be computed more efficiently as
*F*(*C*) - ∩<sub>*i*</sub> *F*(*S*<sub>*i* - *C*</sub>) ,
where *C* is the conflicted state set.
The *auth difference* is calculated by first calculating the full auth
chain for each state *S*<sub>*i*</sub>, that is the union of the auth
chains for each event in *S*<sub>*i*</sub>, and then taking every event
that doesn't appear in every auth chain. If *C*<sub>*i*</sub> is the
full auth chain of *S*<sub>*i*</sub>, then the auth difference is
 ∪ *C*<sub>*i*</sub> −  ∩ *C*<sub>*i*</sub>.
**Full conflicted set.**
The *full conflicted set* is the union of the conflicted state set and