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Fixes #415
Replaced a call to a private Lumino function that stoped being exported: jupyterlab/lumino@f4feada / jupyterlab/lumino#319
The call is replaced with a call to a new copy of the (small) function we were previously calling.
Testing performed
Just manual testing of the selection functionality.
Additional context
This is the bare minimum required to fix the issue in the description.
There are other issues when switching to JupyterLab 4.0. Would it be worth upgrading the dependencies of this library to Lumino or do we want to keep compatibility with older versions of JupyterLab?
This requires #419