Looks up stock_id in the icon factory, returning an icon set
if found, otherwise NULL. For display to the user, you should
use Style.lookupIconSet on the gtk.Style for the
widget that will display the icon, instead of using this
function directly, so that themes are taken into account.
Looks up stock_id in the icon factory, returning an icon set if found, otherwise NULL. For display to the user, you should use Style.lookupIconSet on the gtk.Style for the widget that will display the icon, instead of using this function directly, so that themes are taken into account.