The current version of
VIM (vi improved)
does not handle bidirectionality correctly, as does vi.iv.
It is therefore necessary to transfer the bi-directional behavior of vi.iv
to VIM. This will allow VIM to be used for editing Arabic, Hebrew, Persian,
Habusha, U. and Berry, D.M. ``vi.iv, a Bi-Directional Version of
the vi Full-Screen Editor,''
Electronic Publishing, Origination, Dissemination, and Design,
3:2, pp. 65--91, 1990