[Fontinst] \resetint{letterspacing}{}

[Peter Harmand]

Dear list,
when letterspacing a small caps font I replace germandbls with two spaced
s's by means of:

% ssls.mtx
\relax
\metrics

\resetglyph{germandbls}
   \glyph{s}{1000}
   \movert{\add{\kerning{s}{s}}{\int{letterspacing}}}
   \glyph{s}{1000}
\endsetglyph

\setleftrightkerning{germandbls}{s}{1000}

\endmetrics
% end of ssls.mtx

This works fine unless I do it twice with different values of letterspacing.
In the following fragment 8yls.etx adds letterspacing to interword and
kills the f-ligatures -- you can use 8y.etx for testing.

% begin{fragment}
\transformfont{mosc}{\reencodefont{8y}{\fromafm{mosc____}}}

\setint{letterspacing}{150}
\installfont{test150}{mosc,ssls,8y}{8yls}{}{}{}{}{}

\resetint{letterspacing}{100}
\installfont{test100}{mosc,ssls,8y}{8yls}{}{}{}{}{}
% end{fragment}

This gives in test100.vpl the correct new space on the boundaries
but the old first space between the two s:

% begin{fragment}
(CHARACTER D 223 (COMMENT germandbls)
   (CHARWD R 1.082)
   (CHARHT R 0.458)
   (CHARDP R 0.012)
   (MAP
      (MOVERIGHT R 0.05)
      (SETCHAR D 115) (COMMENT s)
      (MOVERIGHT R 0.15)
      (SETCHAR D 115) (COMMENT s)
      (MOVERIGHT R 0.05)
      )
   )
% end{fragment}

??? Can somebody help me?

Thanks in advance,
Peter