activatable_widget
Description:
The activatable widget for this row.
The widget is activated, either by clicking on it, by calling [method@ActionRow.activate], or via mnemonics in the title or the subtitle. See the [property@ActionRow:use-underline] property to enable mnemonics.
The target widget will be activated by emitting the [signal@Gtk.Widget:HdyActionRow:mnemonic-activate] signal on it.