"View" menu has useless "Menu Bar" item

What if someone don't use global menu?

I have no problem with the item being present when someone isn't using the global menu bar.

I'm pretty certain this is an issue in the global menu rendering, not in xchat or the other applications themselves.

It can't be an issue with the global menu rendering, because the rendering system can't possibly tell which menu items are for hiding an in-window menu bar and which aren't. (It could try, by looking for the string "Menu Bar" or "Menubar", but the menus might not be in English.)

XChat needs to not have a "View" > "Menu Bar" item, when running in Unity, for exactly the same reason as XChat Azure doesn't have a "View" > "Menu Bar" item on Mac OS X.

Is it possible for a program to recognize if its menu is rendered in global menu bar? If not, how can it display this menu entry if someone is useing global menu bar and hide if not?

Sorry. Should be: how can it hide this menu entry if someone is useing global menu bar and show if not?

Yes, <https://wiki.ubuntu.com/MenuBar#detecting> describes how to detect whether the global menu bar is in use. So I guess the fix will look something like this:

if (gtk_menu_proxy_get() != NULL) {
    # existing code that adds the "Menu Bar" item
    # to the "View" menu goes here
}

Actually, I guess that should be "(gtk_menu_proxy_get() == NULL)", since you want to add the item only if the global menu bar is *not* in use.