[BUG] cElementTree can't handle attributes with tabs

[John Arbash Meinel]

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It seems that cElementTree converts attributes with tabs into plain
spaces. At least as of cElementTree-1.0.5_20051216-py2.4

I was trying to test bundles with a tab character in files, and it seems
that right now, bzr can't handle those files.

>>> e = cElementTree.Element('foo')
>>> cElementTree.tostring(e)
'<foo />'
>>> e.set('name', 'foo\tbar')
>>> cElementTree.tostring(e)
'<foo name="foo\tbar" />'

So far so good, the writer is working
>>> f = cElementTree.fromstring(cElementTree.tostring(e))
>>> f.items()
[('name', 'foo bar')]
>>> f.get('name')
'foo bar'

This seems like a pretty serious bug in cElementTree, can people try it
with their version, and see if it occurs there as well?

Thanks,
John
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