Creation/Grading Mode does not work correctly in windowing mode 'full'

[florian-jaeger]

Describe the bug
The Creation/Grading Mode functionality is not operating correctly when JupyterLab is set to windowing mode 'full'. The same functionality works normally when the windowing mode is set to 'defer'. The core issue seems to be related to cells being lazy-loaded in 'full' windowing mode.

To Reproduce
Steps to reproduce the behavior:

1. Open JupyterLab.
2. Switch to windowing mode 'full'.
3. Attempt to use Creation/Grading Mode on a notebook.
4. Observe that the Creation/Grading Mode does show all cell widgets.
5. Switch to windowing mode 'defer'.
6. Repeat the same steps in Creation/Grading Mode.
7. Note that the functionality works correctly in 'defer' mode.

Expected behavior
The Creation/Grading Mode should work correctly in both windowing modes ('full' and 'defer'), without issues related to lazy loading of cells.

Relevant Links

• https://jupyterlab.readthedocs.io/en/latest/getting_started/changelog.html#full-notebook-windowing-mode-by-default