code: func AppChooserWidgetNew(content_type string) (*AppChooserWidget, error) {
  	cstr := C.CString(content_type)
  	defer C.free(unsafe.Pointer(cstr))
  	c := C.gtk_app_chooser_widget_new((*C.gchar)(cstr))
  	if c == nil {
  		return nil, nilPtrErr
  	}
  	return wrapAppChooserWidget(glib.Take(unsafe.Pointer(c))), nil
  }
docs: // AppChooserWidgetNew() is a wrapper around gtk_app_chooser_widget_new().