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4.10 Auto-Show a List of Completions

One out of the completion tooltip, pop-up frame, or menu can be displayed automatically when you start completing (it makes no sense to display more than one of them at a time; they would simply mask each other). It can either be displayed immediately, or only after Emacs has been idle for a number of seconds. The following variables control this feature:

When set to tooltip, pop-up or menu, the corresponding list of completions is displayed automatically when completing. When nil, nothing is displayed automatically (they can still be displayed manually when required).
Number of seconds (integer) that Emacs must be idle before the list of completions is displayed.