From 674615e1d0cce1db3faacc945370684d37adc7d3 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Sat, 26 May 2018 08:14:47 +0530
Subject: [PATCH] Edit book: Fix a regression in the previous release that
 broke syncing between the editor and the Preview panel/Live CSS panel. Fixes
 #1773424 [Editor : preview
 panel](https://bugs.launchpad.net/calibre/+bug/1773424)

---
 src/calibre/ebooks/oeb/polish/parsing.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/calibre/ebooks/oeb/polish/parsing.py b/src/calibre/ebooks/oeb/polish/parsing.py
index 20f4065839..e89275393c 100644
--- a/src/calibre/ebooks/oeb/polish/parsing.py
+++ b/src/calibre/ebooks/oeb/polish/parsing.py
@@ -52,7 +52,7 @@ def handle_private_entities(data):
         idx = data.find('<HTML')
     if idx > -1:
         pre = data[:idx]
-        data = data[idx:]
+        num_of_nl_in_pre = pre.count('\n')
         if '<!DOCTYPE' in pre:  # Handle user defined entities
             user_entities = {}
             for match in re.finditer(r'<!ENTITY\s+(\S+)\s+([^>]+)', pre):
@@ -61,6 +61,7 @@ def handle_private_entities(data):
                     val = val[1:-1]
                 user_entities[match.group(1)] = val
             if user_entities:
+                data = ('\n' * num_of_nl_in_pre) + data[idx:]
                 pat = re.compile(r'&(%s);'%('|'.join(user_entities.keys())))
                 data = pat.sub(lambda m:user_entities[m.group(1)], data)
     return data