Source : Free On-Line Dictionary of Computing

miswart
     
        /mis-wort/ [By analogy with {misbug}] A {feature} that
        superficially appears to be a {wart} but has been determined
        to be the {Right Thing}.  For example, in some versions of the
        {Emacs} text editor, the "transpose characters" command
        exchanges the character under the cursor with the one before
        it on the screen, *except* when the cursor is at the end of a
        line, in which case the two characters before the cursor are
        exchanged.  While this behaviour is perhaps surprising, and
        certainly inconsistent, it has been found through extensive
        experimentation to be what most users want.  This feature is a
        miswart.
     
        [{Jargon File}]