synapse/changelog.d/5700.bugfix

Fix some problems with authenticating redactions in recent room versions.
Fix redaction authentication (#5700) Ensures that redactions are correctly authenticated for recent room versions. There are a few things going on here: * `_fetch_event_rows` is updated to return a dict rather than a list of rows. * Rather than returning multiple copies of an event which was redacted multiple times, it returns the redactions as a list within the dict. * It also returns the actual rejection reason, rather than merely the fact that it was rejected, so that we don't have to query the table again in `_get_event_from_row`. * The redaction handling is factored out of `_get_event_from_row`, and now checks if any of the redactions are valid. 2019-07-17 15:52:02 +00:00			`Fix some problems with authenticating redactions in recent room versions.`