Text wobbles around as I type

### Steps to reproduce

1. In a room, with my cursor in either the existing composer or the new "rich" composer
2. Type a bit and notice the fonts wobble around a bit sometimes
3. Specific example - if I type a capital letter after ` - `, the dash moves upwards a bit, but if I type a lower case followed by a capital, it does not


### Outcome

#### What did you expect?
I expected the characters I had already typed to be unaffected by later characters (except where I was doing some clever input methods thing).

#### What happened instead?
Characters I have already typed sometimes wobble a bit.

### Operating system

Ubuntu 22.04

### Browser information

Firefox 106.0.2

### URL for webapp

https://develop.element.io

### Application version

Element version: 9c302f303aee-react-5f540eb25c31-js-db49cd8d1395 Olm version: 3.2.12

### Homeserver

matrix.org

### Will you send logs?

No