Gitter sunsetting: Can't go back to previous room version if I've never been there

[andybalaam]

Steps to reproduce

1. Visit a room that has a predecessor (defined in the create event, or, if you like, defined via MSC2946 if you've enabled the labs flag).
2. Scroll to the top
3. Look for the "This room is a continuation of another conversation." tile

Outcome

What did you expect?

The tile to appear, and to be able to (attempt to) go back to the predecessor room.

What happened instead?

No tile appeared, and this error message appeared in the console:

Failed to find predecessor room with id !etcetc:gitter.im

Operating system

Ubuntu 22.04

Browser information

Firefox 109.0.1

URL for webapp

https://develop.element.io

Application version

Element version: 27f1d99-react-5ac014ff294d-js-8a3d7d5671e5 Olm version: 3.2.12

Homeserver

matrix.org

Will you send logs?

No

[andybalaam]

Workaround: if you post a normal message linking to the predecessor, then after the user has clicked that link, they will see the tile as normal.

[MadLittleMods]

No tile appeared, and this error message appeared in the console:

Failed to find predecessor room with id !etcetc:gitter.im

Alongside fixing the problem here for the tile to show, we should update our tiles to show an error more clearly whenever a tile fails to appear. Showing some error feedback is much better than silently failing and having the user go on a goose chase to find out why it's not there or just assume they've done something wrong.