synapse/changelog.d/17064.bugfix
Erik Johnston 1f8f991d51
Add back fast path for non-gappy syncs (#17064)
PR #16942 removed an invalid optimisation that avoided pulling out state
for non-gappy syncs. This causes a large increase in DB usage. c.f.
#16941 for why that optimisation was wrong.

However, we can still optimise in the simple case where the events in
the timeline are a linear chain without any branching/merging of the
DAG.

cc. @richvdh
2024-04-08 14:25:28 +01:00

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Fix various long-standing bugs which could cause incorrect state to be returned from `/sync` in certain situations.