Scrolling: Clicking on a permalink often ends up with the permalink being scrolled off the screen

### Steps to reproduce

1. Do a search
2. Click on a permalink surrounded by dynamic content (replies, url previews, images). I don't have a good repro example yet.
3. Observe that as forward-pagination occurs, the permalink gets scrolled upwards, until it can easily end up off the top of the page

### Outcome

#### What did you expect?

Permalinks should be scroll-locked while the surrounding context loads.

#### What happened instead?

They can get pushed off the top of the page

### Operating system

macOS

### Application version

nightly

### How did you install the app?

nightly

### Homeserver

matrix.org

### Will you send logs?

No