Fix resize cursor not being cleared when mouse moves over child widgets

plugins/samplesink/testsink/testsinkgui.cpp

@@ -79,6 +79,7 @@ TestSinkGui::TestSinkGui(DeviceUISet *deviceUISet, QWidget* parent) :
 
 	displaySettings();
     makeUIConnections();
+    m_resizer.enableChildMouseTracking();
 
     connect(&m_inputMessageQueue, SIGNAL(messageEnqueued()), this, SLOT(handleInputMessages()), Qt::QueuedConnection);
     connect(this, SIGNAL(customContextMenuRequested(const QPoint &)), this, SLOT(openDeviceSettingsDialog(const QPoint &)));