[lsb@lsb.org: [EAI] (summary) display of RightToLeft chars in localparts and hostnames]

[Soobok Lee]

this is another problem from bidi localparts:

> > > (storage order)
> > >   LocalRTL at FirstRTL.SecondRTL.com
> > >
> > > (old display order)
> > >   LTRdnoceS.LTRtsriF at LTRlacoL.com
> >

after applying    " s/([.@])/(LRE)&1(PDF)/g ";  
we get:
      (new storage order for display)
        LocalRTL(LRE)@(PDF)FirstRTL(LRE).(PDF)SecondRTL(LRE).(PDF)com

When stringprep200?, 2nd and 3rd LRE will be deleted/prohibited, 
but first LRE which is part of localpart string  
would remain *attached* unless we apply some kind of preprocessing
to delete it before using it as recipient address in composing/replying.

This problem occurs when below displayed address is copy&pasted into
recipient address entry form in EAI-capable MUA for replying/composing.


> >   (new display order)
> >    LTRlacoL at LTRtsriF.LTRdnoceS.com

Soobok