void gtk_icon_source_set_direction_wildcarded ( GtkIconSource* source, gboolean setting )
If the text direction is wildcarded, this source can be used
as the base image for an icon in any
If the text direction is not wildcarded, then the
text direction the icon source applies to should be set
with gtk_icon_source_set_direction(), and the icon source
will only be used with that text direction.
GtkIconSet prefers non-wildcarded sources (exact matches) over
wildcarded sources, and will use an exact match when possible.