Pasting a message from the primary selection includes the "Seen by" part

### Steps to reproduce

Triple click a message to select the text, it highlights the text only.

Paste the text from primary selection using M3, mouse wheel button pressed.
(This is not the same as pasting from clipboard, those are 2 different buffers)

It partially includes "Seen by", for example:

> Thank you!
> +15
> JGNC

("G", "N" and "C" are users without a personal avatar picture)

Copy&paste with ctrl+c ctrl+v works as expected.

### Outcome

#### What did you expect?
Same behaviour as c&p using ctrl+c & ctrl+v
#### What happened instead?


### Operating system

Arch Linux

### Application version

1.11.20-1

### How did you install the app?

Arch repository

### Homeserver

matrix.org

### Will you send logs?

No