How to stop an app from Requesting Attention/Alerting/Appearing in the Task Manager of multiple virtual desktops in KDE?

I commonly have this issue with both Unity and KakaoTalk - the apps constantly do this "alert" or "Request Attention" state where they appear orange and become visible on the task bar of all virtual desktops: How can I disable this? I checked the Task Manager settings, KWin rules, switching to Icons-only mode, but haven't found something that works.