[XeTeX] Unexpected behaviour

[Wlodek Bzyl]

   Hi

   1. To see hyphens that xetex will find
   in `computer keyboard' I compiled

-------------------------------
\showhyphens{computer keyboard}
\end
-------------------------------

   The results appeared on the terminal:

Underfull \hbox (badness 10000) in paragraph at lines 10--10
[] \tenrm com-puter key-board

   But compiling

----------------------------------------------
\font\tenrm="Latin Modern Roman-Regular 10"
\showhyphens{computer keyboard}
\end
-----------------------------------------------

   produces different results:

Underfull \hbox (badness 10000) in paragraph at lines 10--10
[] \tenrm computer keyboard

   2. If we replace in plain.tex the line

   \font\tenrm=cmr10 % roman text

      for

   \font\tenrm="Latin Modern Roman-Regular 10"

      then the format file can't be \dumped
      and the following message appears:

    ! Can't \dump a format with preloaded native fonts.


    Any reasons for that?


  --Włodek Bzyl