Why is the theme have sawtooth?

[kgggggb]

qBittorrent & operating system versions

qBittorrent Enhanced: 4.4.3.12 x64 .AppImage OS: Ubuntu 20.04

What is the problem?

Strange sawtooth. Original : Imagur qBittorrent Enhanced: 1 2

Steps to reproduce

No response

Additional context

No response

Log(s) & preferences file(s)

No response

[abcfy2]

Did you mean the dotted box ?

I thinks it's only mean you've clicked or selected this line or item. When you clicked outside, it should disappear.

I think it's GTK2 theme designed by themself.

[kgggggb]

Did you mean the dotted box ?

I thinks it's only mean you've clicked or selected this line or item. When you clicked outside, it should disappear.

I think it's GTK2 theme designed by themself.

Yes, the problem is the original one doesn't have it, I am thinking is there a way to get rid of it.