Double clicking a change ipynb in the working tree/changes view has side-effects

[tonybaloney]

Environment data

• VS Code version:
• Jupyter Extension version (available under the Extensions sidebar): v2021.3.684299474
• Python Extension version (available under the Extensions sidebar): v2021.4.681399556-dev
• OS (Windows | Mac | Linux distro) and version: macOS 11.3
• Python and/or Anaconda version: Python 3.9.1
• Type of virtual environment used (N/A | venv | virtualenv | conda | ...): venv
• Jupyter server running: Local

Expected behaviour

1. Clicking and Double clicking on a changed notebook would have the same effect as any other file.
2. A side-by-side comparison of changes is shown

Actual behaviour

Double-Clicking on a changed notebook from the source control pane opens it twice

Steps to reproduce:

1. Edit a Jupyter notebook in a git repository
2. Save changes
3. Open the Source Control tab in VS Code
4. Single Click on the .ipynb files in the Changes section on the Source Control pane
   **Issue 1: It opens the notebook, not a comparison of changes **
5. Close the tab with the notebook
6. Double click on the .ipynb files in the Changes section on the Source Control pane
   Issue 2: It opens the notebook twice, once as the live notebook and the second as the notebook with the tab (Working changes)

[DonJayamanne]

Duplicate of #633