From ccb3eff05b65d4ee5680ee08a4b7b01f4340b50e Mon Sep 17 00:00:00 2001
From: Adam Victor Nazareth Brandizzi <adam@brandizzi.com.br>
Date: Wed, 31 Jul 2013 22:18:40 -0300
Subject: [PATCH] Fix the issue of renaming user categories to the same name it
 already has resulting in deletion of the category (see
 https://bugs.launchpad.net/calibre/+bug/1207131)

---
 src/calibre/gui2/tag_browser/model.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/calibre/gui2/tag_browser/model.py b/src/calibre/gui2/tag_browser/model.py
index 1b291930fd..ea0e5f5f68 100644
--- a/src/calibre/gui2/tag_browser/model.py
+++ b/src/calibre/gui2/tag_browser/model.py
@@ -971,6 +971,10 @@ class TagsModel(QAbstractItemModel): # {{{
             else:
                 nkey = ckey[:dotpos+1] + val
             nkey_lower = icu_lower(nkey)
+
+            if ckey == nkey:
+                return True
+
             for c in sorted(user_cats.keys(), key=sort_key):
                 if icu_lower(c).startswith(ckey_lower):
                     if len(c) == len(ckey):