[gnote] Fix XmlReader loading unicode files

[Aurimas Černius <aurimasc src gnome org>]

commit 61e1dee51f6d7300651a88fd22e32f4eb60bced5
Author: Aurimas Černius <aurisc4 gmail com>
Date:   Sat Jan 28 23:20:43 2017 +0200

    Fix XmlReader loading unicode files

 src/sharp/xmlreader.cpp |    6 ++----
 1 files changed, 2 insertions(+), 4 deletions(-)
---
diff --git a/src/sharp/xmlreader.cpp b/src/sharp/xmlreader.cpp
index 97f467d..2a7c3a6 100644
--- a/src/sharp/xmlreader.cpp
+++ b/src/sharp/xmlreader.cpp
@@ -81,11 +81,9 @@ namespace sharp {
   void XmlReader::load_buffer(const Glib::ustring &s)
   {
     close();
-    /** we copy the string. It shouldn't be a big deal as the strings
-     * are copy on write.
-     */
     m_buffer = s;
-    m_reader = xmlReaderForMemory(m_buffer.c_str(), m_buffer.size(), "",
+    // use bytes() instead of size(), because of multibyte Unicode characters (need proper C-string length
+    m_reader = xmlReaderForMemory(m_buffer.c_str(), m_buffer.bytes(), "",
                                   "UTF-8", 0);//XML_PARSE_RECOVER);
     m_error = (m_reader == NULL);
     if(m_reader) {