D27169: Make support for the maximized mode partially optional

zzag created this revision.
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REVISION SUMMARY
  Not all Client classes have support for the maximized mode. Therefore,
  it can be made opt-in to reduce the amount of plumbed methods.
  
  Unfortunately, there a few places, which don't have any connection with
  the maximized mode, where AbstractClient::geometryRestore() is used, so
  it cannot be made 100% optional at the moment.

REPOSITORY
  R108 KWin

BRANCH
  make-fullscreen-feature-opt-in

REVISION DETAIL
  https://phabricator.kde.org/D27169

AFFECTED FILES
  abstract_client.cpp
  abstract_client.h
  internal_client.cpp
  internal_client.h
  x11client.cpp
  x11client.h
  xdgshellclient.cpp
  xdgshellclient.h

To: zzag, #kwin
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