Merge pull request docbook#544 from ndw/iss-543

(Re)fix persistent ToC, release 2.4.1

Author: ndw

properties.gradle

@@ -2,8 +2,8 @@
 ext {
   xslTNGtitle = 'DocBook xslTNG'
   xslTNGbaseName = 'docbook-xslTNG'
-  xslTNGversion = '2.4.0'
-  guideVersion = '2.4.0'
+  xslTNGversion = '2.4.1'
+  guideVersion = '2.4.1'
   guidePrerelease = false
 
   docbookVersion = '5.2'

src/guide/xml/changelog.xml

@@ -10,6 +10,23 @@ be of interest to users of the stylesheets. See the commits and pull requests on
 <link xlink:href="https://github.com/docbook/xslTNG/">the repository</link> for
 finer detail.</para>
 
+<section xml:id="r241">
+<info>
+  <title>Changes in version 2.4.1</title>
+  <productnumber>2.4.1</productnumber>
+  <date>2024-10-26</date>
+</info>
+<itemizedlist>
+<listitem>
+<para>A recent fix for bottom-of-page navigation links broke the persistent ToC
+navigation link. This release fixes <emphasis>both</emphasis> of those problems
+simultaneously;
+fixed <link xlink:href="https://github.com/docbook/xslTNG/issues/543">#543</link>.
+</para>
+</listitem>
+</itemizedlist>
+</section>
+
 <section xml:id="r240">
 <info>
   <title>Changes in version 2.4.0</title>

src/main/scss/media-screen.scss

@@ -15,6 +15,7 @@
     --js-controls-header-separator-border-style: 1px solid var(--popup-annotation-border-color);
     --js-controls-color: var(--surface-color);
     --on-js-controls-color: var(--on-surface-color);
+    --z-index-on-top-of-the-world: 100;
 }
 
 html {
@@ -189,7 +190,7 @@ nav table td.next {
 
 nav.bottom {
     background-color: var(--nav-background-color);
-    z-index: 5;
+    z-index: var(--z-index-on-top-of-the-world);
 }
 
 nav.bottom table {
@@ -216,7 +217,7 @@ nav.top {
        but it also interacts with the persistent ToC which must
        go over it. If you're thinking of changing this, think
        of changing js/persistent-toc.js as well. */
-    z-index: 100;
+    z-index: var(--z-index-on-top-of-the-world);
 }
 
 body.home nav.top {