VT-series terminals, bidi scripts, and standards

[Jacob Nevins <jacobn+puttybugs at chiark dot greenend dot org dot uk>]

Since bidi support for PuTTY is under discussion, I thought I'd ask a
newbie question about bidi support in text terminals.

I believe that ECMA-48 [1], which defines how VT-series terminals
work, includes a definition for how such terminals should support
bidirectional scripts. (ECMA TR/53 [2] is a somewhat more digestible
version of the bidi bits.)

  [1] <http://www.ecma.ch/ecma1/STAND/ECMA-048.HTM>
  [2] <http://www.ecma.ch/ecma1/TECHREP/E-TR-053.HTM>

My question is: does anyone (e.g. mlterm) _actually_ implement this
scheme, or do you follow different standards?

(Sorry if this is a FAQ -- I only found one mention on the ECMA
standards on the Arabeyes site.)

[NB, I'm not subscribed to developer at arabeyes dot org dot  Please CC
putty at projects dot tartarus dot org on replies.]