add_display_return_value

Description:

[ Version ( since = "3.0" ) ]
public void add_display_return_value (string name, string nick, string? blurb, bool none_ok, ParamFlags flags)

Add a new Display return value to this.

this	the Procedure.
name	the name of the argument to be created.
nick	the label used in `GimpProcedureDialog`.
blurb	a more detailed help description.
none_ok	Whether no is a valid value.
flags	argument flags.