Undo breaks randomly in cells

[krassowski]

Description

In some large notebooks undo randomly stops working in some cells. There is no useful logs nor anything to help with fixing this.

Reproduce

I don't know how to reproduce this. However, on a certain deployment where I work a lot I witnessed it countless times across 4.2.x versions in last 6 months.

Expected behavior

Undo works reliably.

Context

• Browser and version: Chrome
• JupyterLab version: 4.2.5
• collaboration or ydrive: NO
• LSP installed: NO
• jupyterlab-spellchecker installed: YES
• windowing mode: defer

This is undo in cell editor editor, not cell-level undo.

[krassowski]

The problem might be caused by one of these extensions:

JupyterLab v4.2.5
/opt/conda/envs/default/share/jupyter/labextensions
        jupyterlab-conda-store v2024.3.1 enabled OK (python, jupyterlab-conda-store)
        jupyterlab-pioneer v1.3.0 enabled OK (python, jupyterlab_pioneer)
        dask-labextension v7.0.0 enabled OK (python, dask_labextension)
        jupyterlab_pygments v0.3.0 enabled OK (python, jupyterlab_pygments)
        jupyterlab-gallery v0.4.0 enabled OK (python, jupyterlab_gallery)
        jupyterlab-nvdashboard v0.11.00 enabled OK (python, jupyterlab_nvdashboard)
        jupyterlab-plotly v5.24.1 enabled  X
        jupyterlab-launchpad v1.0.1 enabled OK (python, jupyterlab_launchpad)
        jupyterlab_code_formatter v3.0.2 enabled OK (python, jupyterlab_code_formatter)
        jupyterlab-nebari-mode v0.3.0 enabled OK (python, jupyterlab_nebari_mode)
        jupyter-leaflet v0.19.2 enabled OK
        nbdime-jupyterlab v3.0.2 enabled OK
        jupyter-matplotlib v0.11.4 enabled OK
        @jupyter-notebook/lab-extension v7.2.2 enabled OK
        @jupyterhub/jupyter-server-proxy v4.4.0 enabled OK
        @jupyterlab-contrib/spellchecker v0.8.4 enabled OK (python, jupyterlab-spellchecker)
        @pyviz/jupyterlab_pyviz v3.0.3 enabled OK
        @jupyter-widgets/jupyterlab-manager v5.0.13 enabled OK (python, jupyterlab_widgets)
        @jupyter-widgets/jupyterlab-sidecar v0.7.0 enabled OK (python, sidecar)
        @jupyter-server/resource-usage v1.1.0 enabled OK (python, jupyter-resource-usage)
        @jupyter-ai/core v2.23.0 enabled OK (python, jupyter_ai)
        @jupyterlab/git v0.50.1 enabled OK (python, jupyterlab-git)
        @jupyterlab/scheduler v2.5.2 enabled OK
        @jlab-enhanced/favorites v3.2.2 enabled OK (python, jupyterlab-favorites)