gtk:tool-item-is-important (object)

object -- a gtk:tool-item widget
setting -- a boolean whether the tool item should be considered important

Accessor of the is-important slot of the gtk:tool-item class. The gtk:tool-item-is-important function returns whether the tool item is considered important. The (setf gtk:tool-item-is-important) function sets whether the tool item should be considered important.

The gtk:tool-button class uses this property to determine whether to show or hide its label when the toolbar style is :both-horiz. The result is that only tool buttons with the is-important property set have labels, an effect known as "priority text".