From a837768348809ff83a2f1f495548b6a0fc279000 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Wed, 22 Jul 2015 14:09:26 +0530
Subject: [PATCH] Dont fail to recognize a UTF-8 encoded file even when the
 coding regexp has a spurious match

---
 src/calibre/gui2/tweak_book/diff/main.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/calibre/gui2/tweak_book/diff/main.py b/src/calibre/gui2/tweak_book/diff/main.py
index 9db5ac7ba2..7280b7fd7b 100644
--- a/src/calibre/gui2/tweak_book/diff/main.py
+++ b/src/calibre/gui2/tweak_book/diff/main.py
@@ -118,7 +118,10 @@ def get_decoded_raw(name):
             try:
                 raw = raw.decode(enc)
             except (LookupError, ValueError):
-                pass
+                try:
+                    raw = raw.decode('utf-8')
+                except ValueError:
+                    pass
     return raw, syntax