void gtk_icon_theme_add_resource_path ( GtkIconTheme* icon_theme, const gchar* path )
Adds a resource path that will be looked at when looking for icons, similar to search paths.
This function should be used to make application-specific icons available as part of the icon theme.
The resources are considered as part of the hicolor icon theme
and must be located in subdirectories that are defined in the
hicolor icon theme, such as
Icons that are directly placed in the resource path instead
of a subdirectory are also considered as ultimate fallback.
Available since: 3.14