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Break unnecessary transiency relations caused by many group transient windows.

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Avoids exponentially expensive operations in KWin.
CCBUG: 95231

svn path=/trunk/kdebase/kwin/; revision=393793
This commit is contained in:
Luboš Luňák 2005-02-28 13:43:00 +00:00
parent 90e5b03c31
commit 47075ef04e
1 changed files with 19 additions and 0 deletions
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19
group.cpp
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@ -541,6 +541,25 @@ void Client::checkGroupTransients()
// TODO This could possibly be optimized, it also requires hasTransient() to check for loops.
if( (*it2)->groupTransient() && (*it1)->hasTransient( *it2, true ) && (*it2)->hasTransient( *it1, true ))
(*it2)->transients_list.remove( *it1 );
// if there are already windows W1 and W2, W2 being transient for W1, and group transient W3
// is added, make it transient only for W2, not for W1, because it's already indirectly
// transient for it - the indirect transiency actually shouldn't break anything,
// but it can lead to exponentially expensive operations (#95231)
// TODO this is pretty slow as well
for( ClientList::ConstIterator it3 = group()->members().begin();
it3 != group()->members().end();
++it3 )
{
if( *it1 == *it2 || *it2 == *it3 || *it1 == *it3 )
continue;
if( (*it2)->hasTransient( *it1, false ) && (*it3)->hasTransient( *it1, false ))
{
if( (*it2)->hasTransient( *it3, true ))
(*it3)->transients_list.remove( *it1 );
if( (*it3)->hasTransient( *it2, true ))
(*it2)->transients_list.remove( *it1 );
}
}
}
}
}