Hi, Mirek!
This is certainly an interesting attempt to make better code navigation.
In my opinion previous version had one good ability to switch between native and alphabet sorting. Personally I've used alphabet sorting because generally it was much easier to find one from alphabetically sorted routines.

I also would like to discuss the way items are visualized.

Mirek, it is certainly an era of widescreen PCs now, and it would be good to support widescreen features where possible. So if description of item is better fit into one line, it is better be so. In my opinion, you had an elegant visualization before:
<type> <namespace>::<item>
If you wanted to make it more elegant, you could make it something like this:
<namespace_semitransparent::><item>
(one column of semi-transparent drawn namespaces and next column of item names). And no horizontal lines.
If you need visualization, I'll make it.
This is how in my opinion it could be done better.