Sometimes tab moves to the emoji picker rather than starting tab completion

### Steps to reproduce

1. In the composer, click next to a word that is the start of (or whole of) someone's name
2. Press tab

### Outcome

#### What did you expect?

Auto-complete list opens

#### What happened instead?

Focus moves out of composer onto "emoji" icon

### Operating system

Ubuntu 22.04

### Application version

Element Nightly version: 2023042101 Olm version: 3.2.12

### How did you install the app?

nightly debian

### Homeserver

Synapse 1.8sth

### Will you send logs?

No