Prediction `NextSuggestion` or similar binding that also works with inline predictions

[TBBle]

Prerequisites

• Write a descriptive title.

Description of the new feature/enhancement

Trying out the newly-default inline prediction, and particularly combined with https://github.com/PowerShell/CompletionPredictor, I wanted to have Tab and Shift+Tab work with the predictions rather than the completions, so that I get history (and any other plugins) included in the Tab-complete keyboard habit for free, without losing screen real-estate to the list-view (or having to toggle F2 every time I want to choose a different prediction).

However, the NextSuggestion and PreviousSuggestion bindings only work in list view. They default to unbound, so the arrow keys you naturally use in the prediction list view are clearly magic for list view, not using those bindings.

Proposed technical implementation details (optional)

Either

• NextSuggestion and PreviousSuggestion should work for inline predictions too (which doesn't seem too dangerous a change to me because they default to unbound); or
• another pair of Prediction key bindings that work with inline predictions, e.g. NextInlineSuggestion and PreviousInlineSuggestion.

I'm clearly assuming that the underlying mechanism is the same so this would be a relatively easy feature to add, but that's just an assumption.

[StevenBucher98]

Thanks for the issue @TBBle! Are you trying to use Tab to accept a given inline suggestion? Or cycle through different potential suggestions? and then accept it with the right arrow key?

You can change the AcceptSuggestion binding to have a key to accept the inline suggestion.