filelog: text is stored modified when it starts with '\1\n'

mercurial/filelog.py

@@ -61,7 +61,7 b' class filelog(revlog.revlog):'
         """compare text with a given file revision"""
 
         # for renames, we have to go the slow way
-        if self.renamed(node):
+        if text.startswith('\1\n') or self.renamed(node):
             t2 = self.read(node)
             return t2 != text