From db50be8a06eb0f9f5981f061cc1a12e4de5c507b Mon Sep 17 00:00:00 2001
From: Domenico Francesco Bruscino <brusdev@apache.org>
Date: Sun, 6 Sep 2020 15:54:28 +0200
Subject: [PATCH] Fix PDF table of content bookmarks

Set the book-chapter visibility to hidden because the elements with none display
are not included in the PDF docs breaking the table of content bookmarks.
---
 src/less/ebook/base.less | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/less/ebook/base.less b/src/less/ebook/base.less
index 21a7942b..0102cc90 100644
--- a/src/less/ebook/base.less
+++ b/src/less/ebook/base.less
@@ -17,7 +17,10 @@ body {
 
     // Hide the title (only used to build PDF table of content)
     .book-chapter {
-        display: none;
+        visibility:hidden;
+        overflow:hidden;
+        height:0;
+        width:0;
     }
 }