[Patch] Knode: real solution for the circular references problem

[Christian Gebauer]

Hi,

I would like to commit the attached patch to fix the
problem of circular references in broken newsgroup articles.
Cp Hennessy and Mathias Waack already solved some of the
symptoms, but I am still able to reproduce #49903 with
the current CVS version.
AFAIK the real solution is to prevent cycles in the
references tree. This is achived by adding a check in 
KNRemoteArticle::setIdRef(), which prevents that an article 
references itself and a more sophisticated search for loops in 
KNGroup::buildThreads().

Please test the patch.

Greetings
Christian
-- 
>><< Christian Gebauer >><< gebauer at kde.org >><< ICQ 14916141 >><<
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