retrieveActions property
Return a list of secondary actions this runner can perform.
If this function returns any SecondaryActions the runner results will have an icon(s) to the right to allow the user to trigger secondary actions for a match.
Example: The runner returns a list files. The primary action will call
runAction with no actionId, and perhaps the runner will launch
that file. The runner had also returned an SecondaryAction from this function,
and when runAction is called with that SecondaryAction's id (by the user
clicking the icon in the match or pressing Shift+Enter) the callback
can know to run the secondary action on that match, such as perhaps
opening that file's containing folder instead.
Implementation
final Future<List<SecondaryAction>> Function() retrieveActions;