miswart

miswart /mis-wort/ n.  [from {wart} 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 behavior is perhaps
   surprising, and certainly inconsistent, it has been found through
   extensive experimentation to be what most users want.  This feature
   is a miswart.