Auxiliary characters added prior to autocompleted username

[vtronko]

System:

• Nheko version: 0.6.1-2b31c72
• Installation method: AUR
• Operating System: Archlinux
• Desktop Environment: KDE

Actual behavior

When I use autocomplete to mention a user in a room, and that user's nickname starts with a "\" or "/" (and possibly some other characters, haven't investigated a full subset), an additional slash is added prior to the nickname upon applying autocompletion.

Expected behavior

It shouldn't contain anything but completed username.