D16228: Raise window group together with group transient

zzag created this revision.
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REVISION SUMMARY
  Group transients and "ordinary" transients behave differently with respect
  to activation:
  
  - If an ordinary transient is activated, its main windows will be raised with it;
  - If a group transient is activated, only it will be raised, its window group won't be raised.
  
  That difference exists because transientFor method is meaningless for
  group transients, i.e. it returns nullptr.
  
  This change addresses the problem stated above by using an appropriate
  method to get a list of main clients.
  
  lowerClient will be addressed in another patch.

REPOSITORY
  R108 KWin

BRANCH
  stackingorder-fix-raiseclient-lowerclient

REVISION DETAIL
  https://phabricator.kde.org/D16228

AFFECTED FILES
  autotests/integration/stacking_order_test.cpp
  layers.cpp

To: zzag, #kwin
Cc: kwin, mkulinski, ragreen, jackyalcine, Pitel, iodelay, bwowk, ZrenBot, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart