address #11630 by catching KeyboardInterrupt from event handlers

IPython/core/events.py

@@ -86,7 +86,7 b' class EventManager(object):'
         for func in self.callbacks[event][:]:
             try:
                 func(*args, **kwargs)
-            except Exception:
+            except (Exception, KeyboardInterrupt):
                 print("Error in callback {} (for {}):".format(func, event))
                 self.shell.showtraceback()
 

IPython/core/tests/test_events.py

@@ -51,6 +51,12 b' class CallbackTests(unittest.TestCase):'
         with tt.AssertPrints("Error in callback"):
             self.em.trigger('ping_received')
 
+    def test_cb_keyboard_interrupt(self):
+        cb = Mock(side_effect=KeyboardInterrupt)
+        self.em.register('ping_received', cb)
+        with tt.assertPrints("Error in callback"):
+            self.em.trigger('ping_received')
+
     def test_unregister_during_callback(self):
         invoked = [False] * 3