MnemonicAction 
    open class MnemonicAction(val gtkMnemonicActionPointer: <Error class: unknown class><<Error class: unknown class>>) : ShortcutAction(source)
A GtkShortcutAction that calls gtk_widget_mnemonic_activate().
Constructors
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.