load %guiref magic on kernel start

IPython/frontend/qt/console/ipython_widget.py

@@ -255,11 +255,27 b' class IPythonWidget(FrontendWidget):'
             self._append_plain_text(u'\n', True)
 
     def _started_channels(self):
-        """ Reimplemented to make a history request.
-        """
+        """Reimplemented to make a history request and load %guiref."""
         super(IPythonWidget, self)._started_channels()
+        self._load_guiref_magic()
         self.kernel_manager.shell_channel.history(hist_access_type='tail',
                                                   n=1000)
+    
+    def _started_kernel(self):
+        """Load %guiref when the kernel starts (if channels are also started).
+        
+        Principally triggered by kernel restart.
+        """
+        if self.kernel_manager.shell_channel is not None:
+            self._load_guiref_magic()
+    
+    def _load_guiref_magic(self):
+        """Load %guiref magic."""
+        self.kernel_manager.shell_channel.execute('\n'.join([
+            "from IPython.core import usage",
+            "get_ipython().register_magic_function(usage.page_guiref, 'line', 'guiref')",
+        ]), silent=True)
+        
     #---------------------------------------------------------------------------
     # 'ConsoleWidget' public interface
     #---------------------------------------------------------------------------