vim mode disabled for first cell when code cell extension is installed or for current cell when changing CodeMirror settings

[firai]

Description

When a code cell extension, such as jupyterlab-execute-time, is installed alongside jupyterlab-vim, vim mode does not initialize in the first cell, and the user must switch to another cell and back in order to enable vim in the first cell.

Upon triage by @krassowski, changing CodeMirror settings for code cells also causes vim mode to be disabled for the current cell.

Reproduce

Type 1

1. Install both jupyterlab-vim and jupyterlab-execute-time
2. Create a new notebook

Type 2

1. Install jupyterlab-vim alone
2. Change CodeMirror settings

Expected behavior

vim mode properly initializes regardless of other extensions

Context

• Extension versions:
  jupyterlab-vim 4.0.3
  jupyterlab-execute-time 3.0.1
• Operating System and its version: Windows
• Browser and its version: Latest Firefox and Edge

[krassowski]

Would you mind opening an issue over in jupyterlab-execute-time?

[firai]

Investigated by @krassowski at deshaw/jupyterlab-execute-time#97 (comment). To be tracked here.

[firai]

Seems like this doesn't occur with every CodeMirror extension. When I use jupyterlab-vim with jupyterlab-indent-guides, neither first load nor changing settings for jupyterlab-indent-guides from the Settings Editor disables vim mode.

[firai]

It seems like the conflict with jupyterlab-execute-time has been fixed by deshaw/jupyterlab-execute-time#120.