Edit UI in threads and narrow right panel looks broken

[turt2live]

Steps to reproduce

1. Send message
2. Send another message to form a thread
3. Start editing a message in that thread

Outcome

What did you expect?

A sensible-looking edit UI. Not entirely sure tbh.

What happened instead?

Operating system

Windows 10

Browser information

Edge

URL for webapp

local build of develop.element.io

Application version

No response

Homeserver

No response

Will you send logs?

No

[luixxiul]

This is also reproduced on the main timeline with the room info panel opened.

The padding of the buttons with fixed pixel value should be replaced with something responsive.