shrink below the minimum, this code would only try to delete it if
it had a parent. Well, even if the window doesn't have a parent,
you want Fdelete_window to signal an error, since you're trying to
shrink below the minimum, this code would only try to delete it if
it had a parent. Well, even if the window doesn't have a parent,
you want Fdelete_window to signal an error, since you're trying to