SignalAction 
    open class SignalAction(val gtkSignalActionPointer: <Error class: unknown class><<Error class: unknown class>>) : ShortcutAction(source)
A GtkShortcutAction that emits a signal.
Signals that are used in this way are referred to as keybinding signals, and they are expected to be defined with the %G_SIGNAL_ACTION flag.
Constructors
Properties
Functions
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                  open fun activate(flags: ShortcutActionFlags, widget: Widget, args: <Error class: unknown class>? = null): Boolean
Activates the action on the @widget with the given @args.