From 43d7a23a8aebd999f7b9956ce4c3c7e474bb211a Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Thu, 14 Aug 2014 15:58:27 +0530
Subject: [PATCH] Fix a regression that broke syntax highlighting in the
 compare books tool

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

diff --git a/src/calibre/gui2/tweak_book/diff/highlight.py b/src/calibre/gui2/tweak_book/diff/highlight.py
index 52325b3e72..43abcaa5bb 100644
--- a/src/calibre/gui2/tweak_book/diff/highlight.py
+++ b/src/calibre/gui2/tweak_book/diff/highlight.py
@@ -31,6 +31,7 @@ class QtHighlighter(QTextDocument):
         ''' Copy specified lines from the syntax highlighted buffer into the
         destination cursor, preserving all formatting created by the syntax
         highlighter. '''
+        self.highlighter.join()
         num = hi - lo
         if num > 0:
             block = self.findBlockByNumber(lo)