Patch for internal debugger framestack speedup

[Falk Brettschneider]

Hi,
The attached patch avoids the rebuild of the framestack listview with 
every single debugging step. Just the line number of listview item #0 
will be changed.
This speeds up internal-debugger stepping at least here where I often 
have a callstack depth of 60 functions.
I already tested it with both, single- and multi-threaded programs.
A second effect is you can look into thread callstacks of other threads 
than the current thread, just by open the listview branch. It wasn't 
possible until now (because of a bug).

Please test it!
One KDevelop developer must give me his OK that I can apply it for 
KDevelop-2.1.1 cvs.

Cheers,
F at lk

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