From 2f2723f6b6b0a63655ddfbd6daed743db0b02ed7 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Sun, 2 Feb 2014 12:03:21 +0530
Subject: [PATCH] Edit book: Do not create savepoints when no changes are
 performed by automated tools such as smarten punctuation, remove unused css
 etc.

---
 src/calibre/gui2/tweak_book/boss.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/calibre/gui2/tweak_book/boss.py b/src/calibre/gui2/tweak_book/boss.py
index 435f63aa8d..a99761940c 100644
--- a/src/calibre/gui2/tweak_book/boss.py
+++ b/src/calibre/gui2/tweak_book/boss.py
@@ -375,6 +375,8 @@ class Boss(QObject):
             self.apply_container_update_to_gui()
             from calibre.ebooks.markdown import markdown
             report = markdown('# %s\n\n'%self.current_metadata.title + '\n\n'.join(report), output_format='html4')
+        if not changed:
+            self.rewind_savepoint()
         d = QDialog(self.gui)
         d.l = QVBoxLayout()
         d.setLayout(d.l)