feat: show call participants in room list (Discord-style)

docs/labs.md

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+# Labs features
+
+If Labs is enabled in the [Element config](config.md), you can enable some of these features by going
+to `Settings->Labs`. This list is non-exhaustive and subject to change, chat in
+[#element-web:matrix.org](https://matrix.to/#/#element-web:matrix.org) for more information.
+
+If a labs features gets more stable, it _may_ be promoted to a beta feature
+(see [Betas](https://github.com/element-hq/element-web/blob/develop/docs/betas.md)).
+
+**Be warned! Labs features are not finalised, they may be fragile, they may change, they may be
+dropped. Ask in the room if you are unclear about any details here.**
+
+## Submit Abuse Report to Moderators [MSC3215](https://github.com/matrix-org/matrix-doc/pull/3215) support (`feature_report_to_moderators`)
+
+A new version of the "Report" dialog that lets users send abuse reports directly to room moderators,
+if the room supports it.
+
+## Render LaTeX maths in messages (`feature_latex_maths`)
+
+Enables rendering of LaTeX maths in messages using [KaTeX](https://katex.org/). LaTeX between single dollar-signs is interpreted as inline maths and double dollar-signs as display maths (i.e. centred on its own line).
+
+## Message pinning (`feature_pinning`)
+
+Allows you to pin messages in the room. To pin a message, use the 3 dots to the right of the message
+and select "Pin".
+
+## Jump to date (`feature_jump_to_date`)
+
+Note: This labs feature is only visible when your homeserver has MSC3030 enabled
+(in Synapse, add `experimental_features` -> `msc3030_enabled` to your
+`homeserver.yaml`) which means `GET /_matrix/client/versions` responds with
+`org.matrix.msc3030` under the `unstable_features` key.
+
+Adds a dropdown menu to the date separator headers in the timeline which allows
+you to jump to last week, last month, the beginning of the room, or choose a
+date from the calendar.
+
+Also adds the `/jumptodate 2022-01-31` slash command.
+
+## New ways to ignore people (`feature_mjolnir`)
+
+When enabled, a new settings tab appears for users to be able to manage their ban lists.
+This is a different kind of ignoring where the ignored user's messages still get rendered,
+but are hidden by default.
+
+Ban lists are rooms within Matrix, proposed as [MSC2313](https://github.com/matrix-org/matrix-doc/pull/2313).
+[Mjolnir](https://github.com/matrix-org/mjolnir) is a set of moderation tools which support
+ban lists.
+
+## Verifications in DMs (`feature_dm_verification`)
+
+An implementation of [MSC2241](https://github.com/matrix-org/matrix-doc/pull/2241). When enabled, verification might not work with devices which don't support MSC2241.
+
+This also includes a new implementation of the user & member info panel, designed to share more code between showing community members & room members. Built on top of this new panel is also a new UX for verification from the member panel.
+
+The setting will be removed in a future release, enabling it non-optionally for
+all users.
+
+## Bridge info tab (`feature_bridge_state`)
+
+Adds a "Bridge Info" tab to the Room Settings dialog, if a compatible bridge is
+present in the room. The Bridge info tab pulls information from the `m.bridge` state event ([MSC2346](https://github.com/matrix-org/matrix-doc/pull/2346)). Since the feature is based upon a MSC, most
+bridges are not expected to be compatible, and users should not rely on this
+tab as the single source of truth just yet.
+
+## Custom themes (`feature_custom_themes`)
+
+Custom themes are possible through Element's [theme support](./theming.md), though
+normally these themes need to be defined in the config for Element. This labs flag
+adds an ability for end users to add themes themselves by using a URL to the JSON
+theme definition.
+
+For some sample themes, check out [aaronraimist/element-themes](https://github.com/aaronraimist/element-themes).
+
+## Live location sharing (`feature_location_share_live`) [In Development]
+
+Enables sharing your current location to the timeline, with live updates.
+
+## Video rooms (`feature_video_rooms`) [Beta]
+
+Enables support for creating video rooms, which are persistent video chats that users can jump in and out of.
+
+## Element Call video rooms (`feature_element_call_video_rooms`) [In Development]
+
+Enables support for video rooms that use Element Call rather than Jitsi, and causes the 'New video room' option to create Element Call video rooms rather than Jitsi ones.
+
+This flag will not have any effect unless `feature_video_rooms` is also enabled.
+
+## New group call experience (`feature_group_calls`) [In Development]
+
+This feature allows users to place native [MSC3401](https://github.com/matrix-org/matrix-spec-proposals/pull/3401) group calls in compatible rooms, using Element Call.
+
+If you're enabling this at the deployment level, you may also want to reference the docs for the `element_call` config section.
+
+## Disable per-sender encryption for Element Call (`feature_disable_call_per_sender_encryption`)
+
+The default for embedded Element Call in Element Web is per-participant encryption.
+This labs flag disables encryption for embedded Element Call in encrypted rooms.
+
+Under the hood this stops Element Web from adding the `perParticipantE2EE` flag for the Element Call widget url.
+
+This is useful while we experiment with encryption and to make calling compatible with platforms that don't use encryption yet.
+
+## Enable the notifications panel in the room header (`feature_notifications`)
+
+Unreliable in encrypted rooms.
+
+## Knock rooms (`feature_ask_to_join`) [In Development]
+
+Enables knock feature for rooms. This allows users to ask to join a room.
+
+## New room list (`feature_new_room_list`) [In Development]
+
+Enable the new room list that is currently in development.
+
+## Exclude insecure devices when sending/receiving messages (`feature_exclude_insecure_devices`)
+
+Do not send or receive messages to/from devices that are not properly verified. Users with unverified devices will not
+receive your messages at all on those devices, and if they send messages, you will not be able to read them, but you
+will be aware that a message exists.
+
+## Encrypted state events (MSC4362) (`feature_msc4362_encrypted_state_events`)
+
+Encrypt most of the state events in the room, including the room name and topic.
+
+WARNING: this means that users joining a room who do not have access to its history will not be able to see the name or
+topic of the room, or any other room state information. It also means the room name and topic are not available before
+joining a room.
+
+## New notifications settings (`feature_notification_settings2`) [Beta]
+
+Replaces the legacy notification settings with a new one to manage push rules.
+
+## User status (`feature_user_status`)
+
+Enables setting a status message in your profile and to be able to view other's statuses.
+Requires [MSC4429](https://github.com/matrix-org/matrix-spec-proposals/pull/4429) and [MSC4426](https://github.com/matrix-org/matrix-spec-proposals/pull/4426).
+
+**Warning** This feature has options which are not backwards compatible, disabling
+it may have unintended consequences.