Framestack widget usability

[Vladimir Prus]

Hi,
I'm working on framestack widget on the MI branch, and it even works, but 
there's a usability issue and I'd appreciate if more experienced KDE 
developers suggest something.

The current look of the widget is at:

   http://zigzag.cs.msu.su/~ghost/framestack.png

Unlike previous code, there are separate columns for function name, arguments 
and source location. Before, those things were not aligned and it was hard to 
read this list.

However, I don't like the fact that the distance between columns is too small, 
this somewhat hampers readability. I haven't found any way to specify extra 
margin between columns for QListView, and I really don't know what's the best 
approach.

One idea that comes to mind is to use alternating background color for 
columns. 

See

   http://zigzag.cs.msu.su/~ghost/framestack2.png  

Any comments or suggestions?

Thanks in advance,
Volodya