* Add `getHistoryVisibility()` and `getGuestAccess()` ([\#1940](https://github.com/matrix-org/matrix-js-sdk/pull/1940)). Contributed by [SimonBrandner](https://github.com/SimonBrandner). * Add `getBuffer()` to `QRCodeData` ([\#1927](https://github.com/matrix-org/matrix-js-sdk/pull/1927)). Contributed by [SimonBrandner](https://github.com/SimonBrandner). * Added `createDataChannel()` and `CallEvent.DataChannel` to `MatrixCall` for creating and listening for WebRTC datachannels. ([\#1929](https://github.com/matrix-org/matrix-js-sdk/pull/1929)). Contributed by [robertlong](https://github.com/robertlong). * Add file locking to MSC3089 branches ([\#1909](https://github.com/matrix-org/matrix-js-sdk/pull/1909)). * Add `hasBeenCancelled` to `VerificationBase` ([\#1915](https://github.com/matrix-org/matrix-js-sdk/pull/1915)). Contributed by [SimonBrandner](https://github.com/SimonBrandner). * Add `ISasEvent` ([\#1908](https://github.com/matrix-org/matrix-js-sdk/pull/1908)). Contributed by [SimonBrandner](https://github.com/SimonBrandner). * Count notifications in encrypted rooms client-side ([\#1872](https://github.com/matrix-org/matrix-js-sdk/pull/1872)). Fixes vector-im/element-web#15393 and vector-im/element-web#15393. Contributed by [SimonBrandner](https://github.com/SimonBrandner). * Exclude opt-in Element performance metrics from encryption ([\#1897](https://github.com/matrix-org/matrix-js-sdk/pull/1897)). * Fix race on automatic backup restore ([\#1936](https://github.com/matrix-org/matrix-js-sdk/pull/1936)). Fixes vector-im/element-web#17781 and vector-im/element-web#17781.