strange code in NSMenuView.m

[Matt Rice]

in -rectOfItemAtIndex:

theres some code in there that looks like
i figure that the == NO test is unneeded and the else
block can be removed, 

but i guess someone somewhere *could* be assigning to
it something other than YES or NO, in which case there
should probably be a comment explaining whats going on

if (_horizontal == YES)
{
  ....
}
else
{
  if (_horizontal == NO)
    {
      ....
    }
  else
    {
      ....
    }
}

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