Commits on Aug 1, 2019

1. Make handling comm messages optional in a kernel connection. …

   The comm message protocol currently has implicit assumptions that only
   one kernel connection is handling comm messages. This option allows a
   kernel connection to opt out of handling comms.
   
   See jupyter/jupyter_client#263
   
   This fixes the error where ipywidgets stops working if you open a notebook and a console to the same kernel, since the console automatically closes all comms since it does not have the comm target registered.

   

   jasongrout committed Aug 1, 2019
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2. Fix handleComms default setting so we can actually set it to false.

   

   jasongrout committed Aug 1, 2019
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3. Consolidate testing utility functions

   

   jasongrout committed Aug 1, 2019
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4. Add testing of handleComms option, fix errors.

   

   jasongrout committed Aug 1, 2019
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5. Make a comm test more robust. …

   It seems that sometimes the defaultKernel wasn’t found in the private list of running kernels…

   

   jasongrout committed Aug 1, 2019
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