Unable to track down a duchain bug

[Hamish Rodda]

Hi,

Quite a while ago David added an assert in the c++ duchain context builder 
that the top level context should not have a parent smart range.

This is quite easily triggerable - just open a project, open any cpp file in 
it (I use kdevplatform and plugins/classmodel.cpp), wait for it to parse, 
then open the corresponding header, and start editing - crash.

I have so far been unable to track down where this occurs.  I attach my 
patches which add debug asserts and smart range watchers to try to find out 
the root cause - so far, all i can see is that top level contexts go into the 
chain ok (probably not as smart ranges), then come out with a spurious parent 
in their smart range.

I guess this may be due to some smart range conversion code (I still think 
it's a mistake to have it in more than one location), but i haven't found it 
yet.  (Note to self: maybe I should review this code.)

If anyone is interested in working on this problem, I attach my debug patches 
+ class (copy to platform/editor, platform/languages/duchain, and 
kdevelop/language/cpp)

Cheers,
Hamish.
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