Serhiy Storchaka added the comment:

LGTM. But the implementation can be more efficient. Here is optimized patch.

34e88a05562f.diff:
$ ./python -m timeit -s 'import textwrap; s = "{0} x\n{0}\tx\n".format(" 
"*100)' -- 'textwrap.dedent(s)'
10000 loops, best of 3: 87.5 usec per loop
$ ./python -m timeit -s 'import textwrap; s = "{0} x\n{0}\tx\n".format(" 
"*1000)' -- 'textwrap.dedent(s)'
1000 loops, best of 3: 780 usec per loop

issue21827.patch:
$ ./python -m timeit -s 'import textwrap; s = "{0} x\n{0}\tx\n".format(" 
"*100)' -- 'textwrap.dedent(s)'
10000 loops, best of 3: 51 usec per loop
$ ./python -m timeit -s 'import textwrap; s = "{0} x\n{0}\tx\n".format(" 
"*1000)' -- 'textwrap.dedent(s)'
1000 loops, best of 3: 395 usec per loop

----------
nosy: +serhiy.storchaka
stage: needs patch -> patch review
versions:  -Python 3.2, Python 3.3
Added file: http://bugs.python.org/file40873/issue21827.patch

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