nbdime
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Enabling extension with `sys-prefix` fails
Currently the sys-prefix arg is passed to labextension install which doesn't handle it, and errors.
https://github.com/jupyter/nbdime/blob/1f864d298b0c6c987316a8cd92fca820ea1d8757/nbdime/main.py#L55
Any suggestions on how to handle this? Is if even necessary for jupyterlab 3?