From 1c7a90f21e0616448fa813d5b8546d9272e81065 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Sun, 21 Sep 2014 15:28:15 +0530
Subject: [PATCH] ...

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

diff --git a/src/calibre/gui2/metadata/basic_widgets.py b/src/calibre/gui2/metadata/basic_widgets.py
index af2b772724..946eafde6b 100644
--- a/src/calibre/gui2/metadata/basic_widgets.py
+++ b/src/calibre/gui2/metadata/basic_widgets.py
@@ -176,6 +176,8 @@ def make_undoable(spinbox):
             if self.allow_undo:
                 cmd = UndoCommand(self, val)
                 self.undo_stack.push(cmd)
+            else:
+                self.undo_stack.clear()
             if hasattr(self, 'setDateTime'):
                 self.setDateTime(val)
             elif hasattr(self, 'setValue'):