gtk/gtk.go
func (v *ToolItem) SetTooltipMarkup(text string) {
	cstr := C.CString(text)
	defer C.free(unsafe.Pointer(cstr))
	C.gtk_tool_item_set_tooltip_markup(v.native(), (*C.gchar)(cstr))
}
func (v *ToolItem) SetTooltipMarkup(text string) {
	cstr := C.CString(text)
	defer C.free(unsafe.Pointer(cstr))
	C.gtk_tool_item_set_tooltip_markup(v.native(), (*C.gchar)(cstr))
}
// SetTooltipMarkup is a wrapper around gtk_tool_item_set_tooltip_markup().