Sometimes windows are marked with Urgent hint in the task manager (when some activity happens in the program for example), which makes the entry in Task manager flash for a short time. However the flashing time is very short, and afterwards depending on the theme, highlighting of that entry can be not very obvious.

Is there a way to configure the duration of the flashing notification for the Urgent hint? I didn't manage to find it in the System Settings. May be somewhere in config files?

Thanks.

Unfortunately this is hard-coded, as a maximum of 6 pulses, with one pulse being made every 500 milliseconds. You'll have to patch the sources if you want to change this.

Thanks, I'll file a feature request to make it configurable then. I'm using Glassified theme, and had to switch Task Manager (aka "Task Items") subtheme to Air, because Air leaves a highlighted border around the entry with the Urgent hint, while Glassified only flashes it a few times, and doesn't add a border later (and different color of the urgent entry itself can blend with the background and it can become confusing).

Submitted a feature request here: https://bugs.kde.org/show_bug.cgi?id=293943

Can you please direct me to the place where it's actually hardcoded? I didn't find these values in the task manager code:
https://projects.kde.org/projects/kde/k ... askmanager

The correct sources here are in plasma/desktop/applets/tasks/. In particular you need to change abstracttaskitem.cpp. The timer in question is "m_attentionTimerId".