set default client_class for QtKernelManager

closes  #3668

IPython/qt/manager.py

@@ -1,52 +1,53 b''
 """ Defines a KernelClient that provides signals and slots.
 """
 
 from IPython.external.qt import QtCore
 
 # Local imports
-from IPython.utils.traitlets import Bool
+from IPython.utils.traitlets import Bool, DottedObjectName
 
 from IPython.kernel import KernelManager
 from IPython.kernel.restarter import KernelRestarter
 
 from .kernel_mixins import QtKernelManagerMixin, QtKernelRestarterMixin
 
 
 class QtKernelRestarter(KernelRestarter, QtKernelRestarterMixin):
 
     def start(self):
         if self._timer is None:
             self._timer = QtCore.QTimer()
             self._timer.timeout.connect(self.poll)
         self._timer.start(self.time_to_dead * 1000)
 
     def stop(self):
         self._timer.stop()
 
     def poll(self):
         super(QtKernelRestarter, self).poll()
 
 
 class QtKernelManager(KernelManager, QtKernelManagerMixin):
     """A KernelManager with Qt signals for restart"""
 
+    client_class = DottedObjectName('IPython.qt.client.QtKernelClient')
     autorestart = Bool(True, config=True)
 
     def start_restarter(self):
         if self.autorestart and self.has_kernel:
             if self._restarter is None:
                 self._restarter = QtKernelRestarter(
                     kernel_manager=self,
                     parent=self,
                     log=self.log,
                 )
                 self._restarter.add_callback(self._handle_kernel_restarted)
             self._restarter.start()
 
     def stop_restarter(self):
         if self.autorestart:
             if self._restarter is not None:
                 self._restarter.stop()
 
     def _handle_kernel_restarted(self):
         self.kernel_restarted.emit()