Plugin registration issue between file browser and github browser

[ryokonorden]

Description

Notebook widgets from Launcher gives "Repository is read only" error after installing jupyterlab-github in JuptyerHub with JupyterLab > ver.4+. It tries to open Untitled.ipynb inside GitHub Browser instead of default File Browser pane.

A workaround is to select any file in the File Browser (no need to open it) before clicking the notebook widgets.

Reproduce

1. Launch JupyterHub (docker run -p 8888:8888 quay.io/jupyter/datascience-notebook:hub-4.1.5)
2. pip install jupyterlab-github
3. Refresh browser
4. Click on any Notebook widgets from Launcher
   

Expected behavior

The new file Untitled.ipynb should open in File Browser pane instead of GitHub browser pane, which is read-only.

Context

• Operating System and version: Ubuntu 20.04.6
• Browser and version: Firefox 115 / Edge 128 / Chrome 127
• JupyterLab version: 4.2.0
• JupyterHub version: 4.1.5

[jtpio]

Thanks @ryokonorden for opening the issue 👍

This appears to be a bug in JupyterLab and is being tracked in jupyterlab/jupyterlab#15629.