From 8bddf72400780ab9ac49d8b8adb882176c3e4c9f Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Tue, 2 Nov 2010 11:00:18 -0600
Subject: [PATCH] MOBI Output: Don't ignore hidden anchors. Fixes #7384 (TOC
 generation in MOBI not working)

---
 src/calibre/ebooks/mobi/mobiml.py | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/calibre/ebooks/mobi/mobiml.py b/src/calibre/ebooks/mobi/mobiml.py
index 0910d10cfb..56930ad2a9 100644
--- a/src/calibre/ebooks/mobi/mobiml.py
+++ b/src/calibre/ebooks/mobi/mobiml.py
@@ -275,7 +275,15 @@ class MobiMLizer(object):
         # <mbp:frame-set/> does not exist lalalala
         if style['display'] in ('none', 'oeb-page-head', 'oeb-page-foot') \
            or style['visibility'] == 'hidden':
-            return
+            id_ = elem.get('id', None)
+            if id_:
+                # Keep anchors so people can use display:none
+                # to generate hidden TOCs
+                elem.clear()
+                elem.text = None
+                elem.set('id', id_)
+            else:
+                return
         tag = barename(elem.tag)
         istate = copy.copy(istates[-1])
         istate.rendered = False