public override void NeedsUpdate(NSMenu menu)
{
// MacOS calls this for each menu when it's about to open, but also for every menu on every keystroke.
// We only want to do the update when the menu's about to open, since it's expensive. Checking whether
// NSMenuProperty.Image needs to be updated is the only way to distinguish between these cases.
//
// http://www.cocoabuilder.com/archive/cocoa/285859-reason-for-menuneedsupdate-notification.html
//
if (menu is MDMenu mdMenu && menu.PropertiesToUpdate().HasFlag(NSMenuProperty.Image))
{
mdMenu.UpdateCommands();
}
}
