IconSource.setStateWildcarded

If the widget state is wildcarded, this source can be used as the base image for an icon in any #GtkStateType. If the widget state is not wildcarded, then the state the source applies to should be set with [gtk.icon_source.IconSource.setState] and the icon source will only be used with that specific state.

#GtkIconSet prefers non-wildcarded sources (exact matches) over wildcarded sources, and will use an exact match when possible.

#GtkIconSet will normally transform wildcarded source images to produce an appropriate icon for a given state, for example lightening an image on prelight, but will not modify source images that match exactly.