ensure discrete headings are not included in page TOC

Author: Dmitriy Razmakhov

preview-src/index.adoc

@@ -285,6 +285,9 @@ Eu mea inani iriure.
 [discrete]
 == Voluptua singulis
 
+[discrete]
+=== Nominavi luptatum
+
 Cum dicat putant ne.
 Est in reque homero principes, meis deleniti mediocrem ad has.
 Ex nam suas nemore dignissim, vel apeirian democritum et.

src/js/02-on-this-page.js

@@ -14,7 +14,7 @@
     var headingSelector = [articleSelector]
     if (level) {
       for (var l = 1; l <= level; l++) headingSelector.push((l === 2 ? '.sectionbody>' : '') + '.sect' + l)
-      headingSelector.push('h' + (level + 1) + '[id]')
+      headingSelector.push('h' + (level + 1) + '[id]' + (level > 1 ? ':not(.discrete)' : ''))
     } else {
       headingSelector.push('h1[id].sect0')
     }