From 15c3a466e53eb0fae9af996ebf5439ee35c4a7fd Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Thu, 20 Feb 2014 21:13:09 +0530
Subject: [PATCH] Edit book: Fix an error that occurs if more than 100
 checkpoints are created. Fixes #1282583 [book editor error when adding 100
 items](https://bugs.launchpad.net/calibre/+bug/1282583)

---
 src/calibre/gui2/tweak_book/undo.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/calibre/gui2/tweak_book/undo.py b/src/calibre/gui2/tweak_book/undo.py
index 5a81aa0e57..f568b30850 100644
--- a/src/calibre/gui2/tweak_book/undo.py
+++ b/src/calibre/gui2/tweak_book/undo.py
@@ -108,6 +108,7 @@ class GlobalUndoHistory(QAbstractListModel):
             self.beginRemoveRows(ROOT, 0, num - 1)
             cleanup(self.states[:num])
             self.states = self.states[num:]
+            self.pos -= num
             self.endRemoveRows()
 
     def rewind_savepoint(self):