Sets whether underlines in the label indicate mnemonics.
If @setting is %TRUE, an underscore character in @self's label indicates a mnemonic accelerator key. This behavior is similar to [property@Gtk.Label:use-underline].
the new value to set
See Implementation
Sets whether underlines in the label indicate mnemonics.
If @setting is %TRUE, an underscore character in @self's label indicates a mnemonic accelerator key. This behavior is similar to [property@Gtk.Label:use-underline].