[Full Changelog](https://github.com/matrix-org/matrix-react-sdk/compare/v3.20.0...v3.21.0-rc.1) * Upgrade to JS SDK 11.0.0-rc.1 * Add disclaimer about subspaces being experimental in add existing dialog [\#5978](https://github.com/matrix-org/matrix-react-sdk/pull/5978) * Spaces Beta release [\#5933](https://github.com/matrix-org/matrix-react-sdk/pull/5933) * Improve permissions error when adding new server to room directory [\#6009](https://github.com/matrix-org/matrix-react-sdk/pull/6009) * Allow user to progress through space creation & setup using Enter [\#6006](https://github.com/matrix-org/matrix-react-sdk/pull/6006) * Upgrade sanitize types [\#6008](https://github.com/matrix-org/matrix-react-sdk/pull/6008) * Upgrade `cheerio` and resolve type errors [\#6007](https://github.com/matrix-org/matrix-react-sdk/pull/6007) * Add slash commands support to edit message composer [\#5865](https://github.com/matrix-org/matrix-react-sdk/pull/5865) * Fix the two todays problem [\#5940](https://github.com/matrix-org/matrix-react-sdk/pull/5940) * Switch the Home Space out for an All rooms space [\#5969](https://github.com/matrix-org/matrix-react-sdk/pull/5969) * Show device ID in UserInfo when there is no device name [\#5985](https://github.com/matrix-org/matrix-react-sdk/pull/5985) * Switch back to release version of `sanitize-html` [\#6005](https://github.com/matrix-org/matrix-react-sdk/pull/6005) * Bump hosted-git-info from 2.8.8 to 2.8.9 [\#5998](https://github.com/matrix-org/matrix-react-sdk/pull/5998) * Don't use the event's metadata to calc the scale of an image [\#5982](https://github.com/matrix-org/matrix-react-sdk/pull/5982) * Adjust MIME type of upload confirmation if needed [\#5981](https://github.com/matrix-org/matrix-react-sdk/pull/5981) * Forbid redaction of encryption events [\#5991](https://github.com/matrix-org/matrix-react-sdk/pull/5991) * Fix voice message playback being squished up against send button [\#5988](https://github.com/matrix-org/matrix-react-sdk/pull/5988) * Improve style of notification badges on the space panel [\#5983](https://github.com/matrix-org/matrix-react-sdk/pull/5983) * Add dev dependency for parse5 typings [\#5990](https://github.com/matrix-org/matrix-react-sdk/pull/5990) * Iterate Spaces admin UX around room management [\#5977](https://github.com/matrix-org/matrix-react-sdk/pull/5977) * Guard all isSpaceRoom calls behind the labs flag [\#5979](https://github.com/matrix-org/matrix-react-sdk/pull/5979) * Bump lodash from 4.17.20 to 4.17.21 [\#5986](https://github.com/matrix-org/matrix-react-sdk/pull/5986) * Bump lodash from 4.17.19 to 4.17.21 in /test/end-to-end-tests [\#5987](https://github.com/matrix-org/matrix-react-sdk/pull/5987) * Bump ua-parser-js from 0.7.23 to 0.7.28 [\#5984](https://github.com/matrix-org/matrix-react-sdk/pull/5984) * Update visual style of plain files in the timeline [\#5971](https://github.com/matrix-org/matrix-react-sdk/pull/5971) * Support for multiple streams (not MSC3077) [\#5833](https://github.com/matrix-org/matrix-react-sdk/pull/5833) * Update space ordering behaviour to match updates in MSC [\#5963](https://github.com/matrix-org/matrix-react-sdk/pull/5963) * Improve performance of search all spaces and space switching [\#5976](https://github.com/matrix-org/matrix-react-sdk/pull/5976) * Update colours and sizing for voice messages [\#5970](https://github.com/matrix-org/matrix-react-sdk/pull/5970) * Update link to Android SDK [\#5973](https://github.com/matrix-org/matrix-react-sdk/pull/5973) * Add cleanup functions for image view [\#5962](https://github.com/matrix-org/matrix-react-sdk/pull/5962) * Add a note about sharing your IP in P2P calls [\#5961](https://github.com/matrix-org/matrix-react-sdk/pull/5961) * Only aggregate DM notifications on the Space Panel in the Home Space [\#5968](https://github.com/matrix-org/matrix-react-sdk/pull/5968) * Add retry mechanism and progress bar to add existing to space dialog [\#5975](https://github.com/matrix-org/matrix-react-sdk/pull/5975) * Warn on access token reveal [\#5755](https://github.com/matrix-org/matrix-react-sdk/pull/5755) * Fix newly joined room appearing under the wrong space [\#5945](https://github.com/matrix-org/matrix-react-sdk/pull/5945) * Early rendering for voice messages in the timeline [\#5955](https://github.com/matrix-org/matrix-react-sdk/pull/5955) * Calculate the real waveform in the Playback class for voice messages [\#5956](https://github.com/matrix-org/matrix-react-sdk/pull/5956) * Don't recurse on arrayFastResample [\#5957](https://github.com/matrix-org/matrix-react-sdk/pull/5957) * Support a dark theme for voice messages [\#5958](https://github.com/matrix-org/matrix-react-sdk/pull/5958) * Handle no/blocked microphones in voice messages [\#5959](https://github.com/matrix-org/matrix-react-sdk/pull/5959)