D14291: Cleanup RemoteAccess buffers on aboutToBeUnbound instead of object destruction

[David Edmundson]

davidedmundson created this revision.
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REVISION SUMMARY
  The destructor or Resource::~Resource will delete the d-pointer used by
  Resource before we reach QObject::~QObject() of the resource which emits
  the destroyed signal. This means this lamba is accessing deleted
  contents.
  
  Based on
  https://build.kde.org/view/Frameworks/job/Frameworks%20kwayland%20kf5-qt5%20SUSEQt5.10/71/testReport/
  
  aboutToBeUnbound is emitted before object destruction.

TEST PLAN
  Relevant unit test still passes and this lambda is still invoked.

REPOSITORY
  R127 KWayland

BRANCH
  dave

REVISION DETAIL
  https://phabricator.kde.org/D14291

AFFECTED FILES
  src/server/remote_access_interface.cpp

To: davidedmundson, #kwin
Cc: kde-frameworks-devel, michaelh, ngraham, bruns
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