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BACKGROUND_COMPLETIONS

nu_experimental

Static BACKGROUND_COMPLETIONS 

Source 
pub static BACKGROUND_COMPLETIONS: ExperimentalOption
Expand description

Run completions on a background thread instead of blocking the line editor.

Disabling restores the pre-0.115 behavior: completions settle on the reedline thread, which blocks while they run, so a custom completer can hand the terminal to an interactive picker ($candidates | fzf) without the line editor stealing its keystrokes.