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History sharing: improve efficiency of building key bundle Signed-off-by: multi [multiestunhappydev@gmail.com](mailto:multiestunhappydev@gmail.com) Partially Implement https://github.com/matrix-org/matrix-rust-sdk/issues/5513 --------- Signed-off-by: multisme <korokoko.toi@gmail.com> Co-authored-by: Richard van der Hoff <richard@matrix.org>