From d4c90ebe46e461d7969a921901eda7f06d5d7741 Mon Sep 17 00:00:00 2001
From: Kesara Rathnayake <kesara@fq.nz>
Date: Fri, 27 Oct 2023 09:18:47 +1300
Subject: [PATCH] fix: Avoid duplicate index entries

---
 xml2rfc/writers/preptool.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/xml2rfc/writers/preptool.py b/xml2rfc/writers/preptool.py
index c5ffb908..88e3cc07 100644
--- a/xml2rfc/writers/preptool.py
+++ b/xml2rfc/writers/preptool.py
@@ -63,6 +63,8 @@
 
 index_item = namedtuple('index_item', ['item', 'sub', 'anchor', 'anchor_tag', 'iref', ])
 
+re_spaces = re.compile(r'\s+')
+
 def uniq(l):
     seen = set()
     ll = []
@@ -1428,7 +1430,7 @@ def get_anchor(parent):
             if not anchor:
                 self.err(e, "Did not find an anchor to use for <iref item='%s'> in <%s>" % (item, p.tag))
             else:
-                self.index_entries.append(index_item(item, sub, anchor, anchor_tag, e))
+                self.index_entries.append(index_item(re_spaces.sub(' ', item), sub, anchor, anchor_tag, e))
 
     def ol_add_counter(self, e, p):
         start = e.get('start')