From 928722690fa947e1f9060fdff46b43e5c52c7bb6 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Mon, 19 Oct 2015 15:59:45 +0530
Subject: [PATCH] Also clear unbdo cache when showing spell check dialog

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

diff --git a/src/calibre/gui2/tweak_book/spell.py b/src/calibre/gui2/tweak_book/spell.py
index 665ccf85c6..7d5342b836 100644
--- a/src/calibre/gui2/tweak_book/spell.py
+++ b/src/calibre/gui2/tweak_book/spell.py
@@ -1250,6 +1250,7 @@ class SpellCheck(Dialog):
 
     def show(self):
         Dialog.show(self)
+        self.undo_cache.clear()
         QTimer.singleShot(0, self.refresh)
 
     def accept(self):