rate-each: Gentle @no

* src/current/compiler/js.xsl (compile-class-condtion)[lv:rate]: Do not
  consider @no's in predicate generation when `@preproc:gentle-no' is set.
* src/current/include/preproc/macros.xsl (preproc:macros)[lv:rate-each]: Set
  `@preproc:gentle-no' on generated `lv:rate', since the generator handles
  `@no' itself.

src/current/compiler/js.xsl

@@ -1182,10 +1182,19 @@
 </template>
 
 <template match="lv:rate" mode="compile-class-condition">
-  <!-- generate expression for class list (leave the @no check to the cmatch
-       algorithm, since we want per-index @no's) -->
+  <variable name="rate" select="." />
+
+  <!-- Generate expression for class list (leave the @no check to the cmatch
+       algorithm, since we want per-index @no's).  If @preproc:gentle-no is
+       set by rate-each expansion, then we want to ignore them entirely,
+       since we do not want it to clear our the final yield (generators take
+       care of this using _CMATCH_). -->
   <text>( </text>
-    <variable name="class-set" select="./lv:class" />
+    <variable name="class-set"
+              select="./lv:class[
+                        ( @no = 'true'
+                          and not( $rate/@preproc:gentle-no = 'true' ) )
+                        or not( @no = 'true' ) ]" />
 
     <choose>
       <when test="$class-set">

src/current/include/preproc/macros.xsl

@@ -407,7 +407,7 @@
   </xsl:message>
   -->
 
-  <lv:rate>
+  <lv:rate preproc:gentle-no="true">
     <xsl:sequence select="@*[
         not( local-name() = 'index' )
         and not( local-name() = 'generates' )