code: func (v *AppChooserWidget) SetDefaultText(text string) {
  	cstr := C.CString(text)
  	defer C.free(unsafe.Pointer(cstr))
  	C.gtk_app_chooser_widget_set_default_text(v.native(), (*C.gchar)(cstr))
  }
docs: // SetDefaultText() is a wrapper around gtk_app_chooser_widget_set_default_text().