Wrong text() adjustment with (math)expression and "\n" (PR#299)

[maechler@stat.math.ethz.ch]

This is adapted from  partha_bagchi@hgsi.com 's report on R-help:

     plot(0); title(expression("Bad\n with much much more text")))

gives something like 

      Bad
          with much much more text

(``newline w/o carriage return'') instead of centering both lines such as

               Bad
     with much much more text

which is produced by (just dropping `expression' from the above)

      plot(0); title(("Bad\n with much much more text"))

By the way, the following would need even more attention if one insists on 
correct behavior:

plot(0)
title(expression(paste("Still works with math\n", "with", 
                       frac(1,sum(x[i], i==1,n)), " and more text")))

Martin Maechler <maechler@stat.math.ethz.ch>	http://stat.ethz.ch/~maechler/

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