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.