Pre-connect chat history shows up as "unknown event" in E2EE rooms

[chmeeedalf]

Description

It looks like Quaternion loads some history (join/leave events), but doesn't load chat events from encrypted rooms. Looking at all the options, it appears past chat messages show up as "Unknown event", rather than chat.

Steps to reproduce

• Join E2EE room from a device running Element (app.element.io)
• Send some messages, receive some.
• Join same room from Quaternion
• Under "View -> Display in Timeline" Select "Unknown events"

Past chats (before login) show up as "Unknown event", cannot be decrypted. Right-clicking and "show detail" gives a clickable link to open in the browser, that I can then open with app.element.io.

Version information

• Quaternion version: 0.0.96 beta (+git)
• Qt version: 5.15.8
• Install method: Compile from source
• Platform: Debian Bookworm, ppc64el

[KitsuneRal]

This is a consequence of not having quotient-im/libQuotient#608 in place.