politically correct version from Simon

Reviewed and tested by me

svn path=/trunk/kdepim/; revision=270964

kmmsgbase.cpp

@@ -20,6 +20,7 @@ using KMail::MessageProperty;
 #include <kmime_codecs.h>
 
 #include <qtextcodec.h>
+#include <qdeepcopy.h>
 
 #include <ctype.h>
 #include <stdlib.h>
@@ -1004,12 +1005,11 @@ void KMMsgBase::setTransferInProgress(bool value, bool force)
 static void swapEndian(QString &str)
 {
   uint len = str.length();
+  str = QDeepCopy<QString>(str);
   QChar *unicode = const_cast<QChar*>( str.unicode() );
-  str.setLength( len ); // detach
-  for (uint i = 0; i < len; i++) {
+  for (uint i = 0; i < len; i++)
     unicode[i] = kmail_swap_16(unicode[i].unicode());
 }
-}
 
 //-----------------------------------------------------------------------------
 static int g_chunk_length = 0, g_chunk_offset=0;