Undo (CTRL+Z) sometimes changes the language type of a cell from F# to C#

[misterspeedy]

Describe the bug

I have noticed that occasionally, the language type ("cell kernel") of a cell changes from F# to C# without my having touched the cell kernel selection.

This often seems to be triggered by hitting CTRL+Z during code editing.

Obviously this is very annoying as previously working F# code can suddenly be covered in errors because an attempt is suddenly being made to parse it as C#.

Please complete the following:

Which version of .NET Interactive are you using? (In a notebook, run the #!about magic command. ):

Version: 1.0.505402+679b09d46fa080ce852eed443c86f2fc70611130

Library version: 1.0.0-beta.24054.2+679b09d46fa080ce852eed443c86f2fc70611130

Build date: 2024-01-05T10:23:27.9287849Z

https://github.com/dotnet/interactive

• OS
  • [ ] Windows 11
  • [x] Windows 10
  • [ ] macOS
  • [ ] Linux (Please specify distro)
  • [ ] iOS
  • [ ] Android
• Browser
  • [ ] Chrome
  • [x] Edge
  • [ ] Firefox
  • [ ] Safari
• Frontend
  • [ ] Jupyter Notebook
  • [ ] Jupyter Lab
  • [ ] nteract
  • [x] Visual Studio Code
  • [ ] Visual Studio Code Insiders
  • [ ] Visual Studio
  • [ ] Other (please specify)

Screenshots

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