readline.set_completion_display_matches_hook([function])
Set or remove the completion display function. If function is specified, it will be used as the new completion display function; if omitted or None
, any completion display function already installed is removed. This sets or clears the rl_completion_display_matches_hook
callback in the underlying library. The completion display function is called as function(substitution, [matches], longest_match_length)
once each time matches need to be displayed.
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