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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:

completion-auto-show
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).
completion-auto-show-delay
Number of seconds (integer) that Emacs must be idle before the list of completions is displayed.