Switch to side-by-side view

--- a/Allura/allura/model/repository.py
+++ b/Allura/allura/model/repository.py
@@ -858,7 +858,7 @@
     def hex(self):
         '''Compute a recursive sha1 hash on the tree'''
         if self._hex is None:
-            sha_obj = sha1(repr(self))
+            sha_obj = sha1('tree\n' + repr(self))
             self._hex = sha_obj.hexdigest()
         return self._hex