Search in upgraded encrypted rooms doesn't search pre-upgrade history

[rda0]

Steps to reproduce

1. Create a private encrypted room (version 6)
2. Send message foo
3. Upgrade the room (version 9)
4. Search for foo in the new room (version 9)
5. Search for foo in the old room (version 6)

What did you expect?

Search results across upgraded rooms.

What happened?

Searches in (4) and (5) do not show any results:

Sometimes however (4) and/or (5) do show some search results.

Operating system

Windows

Application version

Element version: 1.9.0 Olm version: 3.2.3

How did you install the app?

https://element.io/get-started

Homeserver

phys.ethz.ch

Have you submitted a rageshake?

Yes

[kittykat]

@rda0 Can you please test and confirm that the search works before the room upgrade? (between step 2 and 3)

[rda0]

@kittykat I can confirm that the search works between step 2 and 3.

[novocaine]

I can reproduce just by upgrading from 6 to 7.

Old room

Upgraded room

Searching the upgraded room for foo (text in the old room) doesn't work

Searching the upgraded room for foobar (text in the new room) works

[golanv]

For what it's worth, I noticed the same behavior. Search seems to work as expected for non-encrypted rooms though. This actually makes me a little reluctant to upgrade some rooms, as I have some users who seem to rely heavily on search.