From 706307df1fbabede1ea6bea25a4309ab047cde51 Mon Sep 17 00:00:00 2001
From: Pascal de Bruijn <pmjdebruijn@pcode.nl>
Date: Thu, 13 Nov 2025 17:29:08 +0100
Subject: [PATCH 1/2] header-ids: avoid conflicting ids (fixes #661)

---
 lib/markdown2.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/markdown2.py b/lib/markdown2.py
index 913559ba..91b6593c 100755
--- a/lib/markdown2.py
+++ b/lib/markdown2.py
@@ -1560,7 +1560,7 @@ def header_id_from_text(self,
 
         self._count_from_header_id[header_id] += 1
         if 0 == len(header_id) or self._count_from_header_id[header_id] > 1:
-            header_id += '-%s' % self._count_from_header_id[header_id]
+            header_id += ':%s' % self._count_from_header_id[header_id]
 
         return header_id
 

From a3eb81b67b113e312051ad6c64ff22f7574bcc4b Mon Sep 17 00:00:00 2001
From: Pascal de Bruijn <pmjdebruijn@pcode.nl>
Date: Thu, 13 Nov 2025 18:34:43 +0100
Subject: [PATCH 2/2] header-ids: amend test case

---
 test/tm-cases/toc_duplicate_entries.html     | 4 ++--
 test/tm-cases/toc_duplicate_entries.toc_html | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/test/tm-cases/toc_duplicate_entries.html b/test/tm-cases/toc_duplicate_entries.html
index dc051bf7..e72e6e0b 100644
--- a/test/tm-cases/toc_duplicate_entries.html
+++ b/test/tm-cases/toc_duplicate_entries.html
@@ -1,5 +1,5 @@
 <h1 id="abc">abc</h1>
 
-<h1 id="abc-2">abc</h1>
+<h1 id="abc:2">abc</h1>
 
-<h1 id="abc-3">abc</h1>
+<h1 id="abc:3">abc</h1>
diff --git a/test/tm-cases/toc_duplicate_entries.toc_html b/test/tm-cases/toc_duplicate_entries.toc_html
index 72262013..a4861864 100644
--- a/test/tm-cases/toc_duplicate_entries.toc_html
+++ b/test/tm-cases/toc_duplicate_entries.toc_html
@@ -1,5 +1,5 @@
 <ul>
   <li><a href="#abc">abc</a></li>
-  <li><a href="#abc-2">abc</a></li>
-  <li><a href="#abc-3">abc</a></li>
+  <li><a href="#abc:2">abc</a></li>
+  <li><a href="#abc:3">abc</a></li>
 </ul>