D16229: [wayland] Make the "Lower Window" shortcut work with transients

zzag created this revision.
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REVISION SUMMARY
  Currently, the "Lower Window" shortcut doesn't have any effect because
  we lower the transient in the unconstrained stacking order and then we
  "raise" it back when building the constrained stacking order.
  
  If we lower a transient, make sure that main clients are lowered too.

TEST PLAN
  - Assigned a shortcut to "Lower Window" in System Settings;
  - Opened Konsole;
  - Opened Kate and its preferences window;
  - Pressed the shortcut.

REPOSITORY
  R108 KWin

BRANCH
  stackingorder-fix-raiseclient-lowerclient

REVISION DETAIL
  https://phabricator.kde.org/D16229

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