bug#13745: c1-acronyms

[Eli Zaretskii <eliz@gnu.org>]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Date: Wed, 24 Feb 2016 16:48:39 +1100
> Cc: 13745@debbugs.gnu.org
> 
> starback@stp.lingfil.uu.se (Per Starbäck) writes:
> 
> > In GNU Emacs 24.2.93.1.
> >
> > char-acronym-table has three entries with "XXX". They are from
> > lisp/international/characters.el :
> >
> >> (let ((c1-acronyms '("XXX" "XXX" "BPH" "NBH" "IND" "NEL" "SSA" "ESA"
> >> 		     "HTS" "HTJ" "VTS" "PLD" "PLU" "R1"  "SS2" "SS1"
> >> 		     "DCS" "PU1" "PU2" "STS" "CCH" "MW"  "SPA" "EPA"
> >> 		     "SOS" "XXX" "SC1" "CSI" "ST"  "OSC" "PM"  "APC")))
> >
> > These are the three C1 control characters that are listed with no name
> > in Unicode and that aren't part of ISO/IEC 6429.
> >
> > These had the acros PAD, HOP, SGCI in draft DIS 10646, but weren't
> > standardized (not accepted to ISO 10646).
> >
> >   http://en.wikipedia.org/wiki/C0_and_C1_control_codes#C1_set
> >   http://www.aivosto.com/vbtips/control-characters.html
> >
> > I don't like the acronym feature showing different characters the same,
> > so I suggest that "XXX" is replaced by the inofficial PAD, HOP, SGCI
> > here.
> 
> If this list is automatically generated from the C1 control code list,
> then perhaps that generating function should be removed?
> 
> If not, I think your patch is OK, if I understand what it's doing here.
> (I may very well be not.)

I'm okay with applying this, thanks.