Get the full command name from a short abbreviated command name; see |20.2| for details on command abbreviations. {name} may start with a : and can include a [range], these are skipped and not returned. Returns an empty string if a command doesn't exist or if it's ambiguous (for user-defined functions). For example fullcommand('s'), fullcommand('sub'), fullcommand(':%substitute') all return "substitute". Can also be used as a |method|: GetName()->fullcommand()