Fix outdated Nushell completion script

[sibber5]

The current dotnet completions script nushell output and the official documentation are outdated, use deprecated syntax, and contradict the Dynamic completion scripts section of the documentation (the script strips dotnet from the input while the documentation doesnt).

Updated the nushell completions script to follow the official nushell documentation: https://www.nushell.sh/cookbook/external_completers.html

Documentation PR: dotnet/docs#54366

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Updates the Nushell configuration snippet used for dotnet static completions, simplifying the completer function and adding guidance for combining multiple external completers.

Changes:

• Replaced the previous dictionary-based external_completer example with a dedicated dotnet_completer.
• Added a multiple_completers dispatcher and enabled/configured $env.config.completions.external.
• Updated inline guidance and linked Nushell documentation for multiple completers.

[sibber5]

@dotnet-policy-service agree

[baronfel]

Thanks for this, and especially the linked docs PR! This will ship in the .NET 11 preview 6 likely.