The name of the icon from the icon theme.
Note that the stock icon is preferred, if the #GtkAction:stock-id property holds the id of an existing stock icon, and the #GIcon is preferred if the #GtkAction:gicon property is set.
This is an appearance property and thus only applies if #GtkActivatable:use-action-appearance is true.
Builder instance for fluent chaining
Deprecated: Use the "icon" attribute on a #GMenuItem instead
Set iconName property.