From 305379f27f208f6d470104b4ec0655c52d7df1a5 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Tue, 7 Jan 2014 13:35:18 +0530
Subject: [PATCH] Edit book: Fix error when merging html files that include a
 currently opened file and a non-html file is also open

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

diff --git a/src/calibre/gui2/tweak_book/boss.py b/src/calibre/gui2/tweak_book/boss.py
index cabc3e8eb0..fd04f3cb62 100644
--- a/src/calibre/gui2/tweak_book/boss.py
+++ b/src/calibre/gui2/tweak_book/boss.py
@@ -1065,7 +1065,7 @@ class Boss(QObject):
         editor = editors.pop(name)
         self.gui.central.close_editor(editor)
         editor.break_cycles()
-        if not editors:
+        if not editors or getattr(self.gui.central.current_editor, 'syntax', None) != 'html':
             self.gui.preview.clear()
 
     def insert_character(self):