Room list flickering and jumping

### Steps to reproduce

1. Scroll in the room list

I do have this since months, but I just completely reinstalled the app and it is still there.

### What happened?

### What happened?

The room list flickers (collapses rooms) and jumps randomly around.

https://user-images.githubusercontent.com/6731714/134349624-244a72ad-6bf8-4c16-9758-8dfdd31c890e.mp4

Sometimes you can see the placeholder image appear for some milliseconds in between rooms:

### Your phone model

Samsung Galaxy S9 (SM-G960F)

### Operating system version

Andoid 10

### Application version and app store

Element version 1.2.2, olm version 3.2.4, google play store

### Homeserver

phys.ethz.ch

### Have you submitted a rageshake?

Yes