--- lib/difflib.py.orig	2006-05-16 14:15:44.922345700 +0100
+++ lib/difflib.py	2006-05-16 14:08:22.497600600 +0100
@@ -1026,19 +1026,20 @@
         Example:
 
         >>> d = Differ()
-        >>> results = d._qformat('\tabcDefghiJkl\n', '\t\tabcdefGhijkl\n',
-        ...                      '  ^ ^  ^      ', '+  ^ ^  ^      ')
+        >>> results = d._qformat('\tabcDefghiJkl\n', '\tabcdefGhijkl\n',
+        ...                      '  ^ ^  ^      ', '  ^ ^  ^      ')
         >>> for line in results: print repr(line)
         ...
         '- \tabcDefghiJkl\n'
         '? \t ^ ^  ^\n'
-        '+ \t\tabcdefGhijkl\n'
-        '? \t  ^ ^  ^\n'
+        '+ \tabcdefGhijkl\n'
+        '? \t ^ ^  ^\n'
         """
         # Can hurt, but will probably help most of the time.
         common = min(_count_leading(aline, "\t"),
                      _count_leading(bline, "\t"))
         common = min(common, _count_leading(atags[:common], " "))
+        common = min(common, _count_leading(btags[:common], " "))
         atags = atags[common:].rstrip()
         btags = btags[common:].rstrip()