Version:           unspecified (using KDE 4.8.0) 
OS:                Linux

When windows are marked with Urgent hint in the task manager (when some activity happens in the program for example), the entry in Task Manager flashes for a short period (6 times with period of 500 milliseconds). However the overall flashing time is pretty short, and afterwards depending on the theme, highlighting of that entry can be not obvious.

For example I was 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).

Making the flashing behavior for the Urgent hint configurable in the task manager will solve these kind of issues. For example making the period (currently hardcoded to 500 milliseconds) and number of flashes adjustable (number of flashes can be from a fixed number to unlimited for example).

Reproducible: Always

Steps to Reproduce:
1. Pick any window from the list produced with:

wmctrl -l

2. Set the urgent hint for the window using the numeric id of the window in the previous output for example:

wmctrl -i -r <window_id> -b add,demands_attention

You can also do it using the title:

wmctrl -r <window_title> -b add,demands_attention

3. Watch the short urgent notification flashing in the Task Manager widget.

Actual Results:  
Flashing continues for a short time

Expected Results:  
Animation should be configurable with flexible period and either a limited or infinite number of flashings.