[WWcvs] pg: Don't factor negatives out of multiple terms at once.

[dpvc v. a. <we...@ma...>]

Log Message:
-----------
Don't factor negatives out of multiple terms at once.

Modified Files:
--------------
    pg/macros:
        contextLimitedPolynomial.pl

Revision Data
-------------
Index: contextLimitedPolynomial.pl
===================================================================
RCS file: /webwork/cvs/system/pg/macros/contextLimitedPolynomial.pl,v
retrieving revision 1.12
retrieving revision 1.13
diff -Lmacros/contextLimitedPolynomial.pl -Lmacros/contextLimitedPolynomial.pl -u -r1.12 -r1.13
--- macros/contextLimitedPolynomial.pl
+++ macros/contextLimitedPolynomial.pl
@@ -361,6 +361,10 @@
        "${_}h"=>{class => 'LimitedPolynomial::Function::hyperbolic'}
     );
   }
+  #
+  #  Don't convert -ax-b to -(ax+b), etc.
+  #
+  $context->reduction->set("(-x)-y"=>0);
 
   main::Context("LimitedPolynomial");  ### FIXME:  probably should require author to set this explicitly
 }