QChangeArbiter/QPostMan: batch frontend changes

- Updated unit tests
- Added QAbstractPostman and QAbstractArbiter as they are more than
  QObserverInterfaces but still need to be easily testable.

Change-Id: I0fc2ce48031eecc9bf893798650ef68e9d7d8bb7
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/core/nodes/qnode_p.h b/src/core/nodes/qnode_p.h
index 2e3bce219..df651e6b3 100644
--- a/src/core/nodes/qnode_p.h
+++ b/src/core/nodes/qnode_p.h
@@ -70,7 +70,7 @@ public:
 
     // For now this just protects access to the m_changeArbiter.
     // Later on we may decide to extend support for multiple observers.
-    QLockableObserverInterface *m_changeArbiter;
+    QAbstractArbiter *m_changeArbiter;
     QScene *m_scene;
     mutable QNodeId m_id;
     bool m_blockNotifications;