Gtk.MenuToolButton.prototype.set_arrow_tooltip_markup

function set_arrow_tooltip_markup(markup:String):void {
    // Gjs wrapper for gtk_menu_tool_button_set_arrow_tooltip_markup()
}

Sets the tooltip markup text to be used as tooltip for the arrow button which pops up the menu. See Gtk.set_tooltip_text for setting a tooltip on the whole Gtk.MenuToolButton.

Since 2.12