Synapse does not advertise support for MSC3030 or Matrix v1.6 'Jump to Date'

[YamatoRyou]

Description

Clients used during testing:
A: Element Desktop 1.11.23 (OS: 64-bit Windows 7 SP1);
B: Element Desktop 1.11.29 (OS: 64-bit Windows 10, 10.0.19044);
C: Element Web (Dev, version: 38dbd664742a-react-93858813a314-js-d40d5c8a397f, Chromium 102.0.5005.167)

homeserver.yaml has the following flags:

experimental_features:
   msc3030_enabled: true

The performance of each client:
A: There is no "Jump to Date" option in "Labs", but actually this function works normally;
B & C: There is a "jump to date" option in the lab, but this option cannot be enabled, prompting "requires your server to support MSC3030".

GET /_matrix/client/versions result:

{"versions":["r0.0.1","r0.1.0","r0.2.0","r0.3.0","r0.4.0","r0.5.0","r0.6.0","r0 .6.1","v1.1","v1.2","v1.3","v1.4","v1.5"],"unstable_features":{"org.matrix.label_based_filtering":true, "org.matrix.e2e_cross_signing":true,"org.matrix.msc2432":true,"uk.half-shot.msc2666.mutual_rooms":true,"io.element.e2ee_forced.public":false,"io.element .e2ee_forced.private": false,"io.element.e2ee_forced.trusted_private":false,"org.matrix.msc3026.busy_presence":false,"org.matrix.msc2285.stable":true,"org.matrix.msc3827 .stable":true,"org.matrix.msc2716":false,"org.matrix.msc3440.stable":true,"org.matrix.msc3771":true,"org.matrix.msc3773":false,"fi .mau.msc2815":false,"fi.mau.msc2659":false,"org.matrix.msc3882":true,"org.matrix.msc3881":true,"org.matrix.msc3874":false,"org .matrix.msc3886":true,"org.matrix.msc3912":false,"org.matrix.msc3952_intentional_mentions":false}}

Steps to reproduce

n/a

Homeserver

Self-hosted

Synapse Version

Synapse 1.81.0

Installation Method

Docker (matrixdotorg/synapse)

Database

PostgreSQL 14.5

Workers

Single process

Platform

Linux DiskStation 3.10.105 #25426 SMP Mon Dec 14 18:46:52 CST 2020 x86_64 GNU/Linux

Configuration

experimental_features:
   msc3030_enabled: true

Relevant log output

n/a

Anything else that would be useful to know?

Related issues: element-hq/element-web#24976

[reivilibre]

From the MSC:

Servers will indicate support for the new endpoint via a non-empty value for feature flag org.matrix.msc3030 in unstable_features in the response to GET /_matrix/client/versions.

However the MSC has been stabilised and merged into the next spec version — the codebase no longer mentions MSC3030 at all and the option msc3030_enabled: true has been removed.

This endpoint is under a stable prefix now ("^/_matrix/client/v1/rooms/(?P<room_id>[^/]*)/timestamp_to_event$"), which was added in v1.6 of the Matrix specification.

So the real issue seems to be that Synapse needs to support spec version v1.6 and advertise support for it... I will create a new issue for this, since it doesn't seem we even have a tracking issue for v1.6 support...

[reivilibre]

See #15451, the issue tracking Matrix v1.6 support.

[clokep]

I think this is essentially a duplicate of #15089?