[Backport staging] Release tranche of breaking changes #4975
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* Remove deprecated `IJoinRoomOpts.syncRoom` option (#4914) This option is non-functional, and was deprecated in #4913. Remove it altogether. * Remove support for `onlyData != true` (#4939) * Remove deprecated fields, methods, utilities (#4959) --------- Co-authored-by: Richard van der Hoff <[email protected]> Co-authored-by: Richard van der Hoff <[email protected]> (cherry picked from commit b80d009)
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For js-sdk users, this includes the following:
- Send stable identifier `sender_device_keys` for MSC4147 (Including device keys with Olm-encrypted events).
([matrix-org#4964](matrix-org/matrix-rust-sdk#4964))
- Check the `sender_device_keys` field on _all_ incoming Olm-encrypted to-device messages and ignore any to-device messages which include the field but whose data is invalid (as per [MSC4147](matrix-org/matrix-spec-proposals#4147)).
([matrix-org#4922](matrix-org/matrix-rust-sdk#4922))
- Fix bug which caused room keys to be unnecessarily rotated on every send in the presence of blacklisted/withheld devices in the room.
([matrix-org#4954](matrix-org/matrix-rust-sdk#4954))
- Fix [matrix-rust-sdk#2729](matrix-org/matrix-rust-sdk#2729) which in rare cases can cause room key oversharing.
([matrix-org#4975](matrix-org/matrix-rust-sdk#4975))
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Backport b80d009 from #4963.