Previous selection stays active when making a new selection

[NotAFile]

System:

• Nheko version: 0.5.3
• Installation method: fractal
• Operating System: linux
• Desktop Environment: i3

Actual behavior

When creating a new selection inside a different message, the previous message stays selected. However, this is purely visual.

Expected behavior

When creating a new selection, the previous selection should disappear.

Steps to reproduce

1. Select text in one message
2. Select text in another message

Logs

Debugger backtrace

[xvitaly]

I can confirm this issue. nheko 0.5.3 on Fedora 28 with KDE Plasma 5. Qt 5.10.1.