fix: too many arguments dropped when passing to base comm constructor (#1051)

Co-authored-by: martinRenou <martin.renou@gmail.com>
Closes #1050

Author: maartenbreddels

ipykernel/comm/comm.py

@@ -71,9 +71,8 @@ def _default_comm_id(self):
     def __init__(self, *args, **kwargs):
         # Comm takes positional arguments, LoggingConfigurable does not, so we explicitly forward arguments
         traitlets.config.LoggingConfigurable.__init__(self, **kwargs)
-        for name in self.trait_names():
-            if name in kwargs:
-                kwargs.pop(name)
+        # drop arguments not in BaseComm
+        kwargs.pop("kernel", None)
         BaseComm.__init__(self, *args, **kwargs)
 
 

ipykernel/tests/test_comm.py

@@ -6,7 +6,7 @@ def test_comm(kernel):
     manager = CommManager(kernel=kernel)
     kernel.comm_manager = manager
 
-    c = Comm(kernel=kernel)
+    c = Comm(kernel=kernel, target_name="bar")
     msgs = []
 
     def on_close(msg):
@@ -23,6 +23,7 @@ def on_message(msg):
     c.handle_close({})
     c.close()
     assert len(msgs) == 2
+    assert c.target_name == "bar"
 
 
 def test_comm_manager(kernel):