If @index_ has a valid keyval, this function will return %TRUE and fill in @keyval and @modifiers with the keyval settings.
the index of the macro button to get.
return value for the keyval.
return value for modifiers.
%TRUE if keyval is set for @index.
2.20
See Implementation
If @index_ has a valid keyval, this function will return %TRUE and fill in @keyval and @modifiers with the keyval settings.