[MERGE] alias to respect spaces in quoted arguments

[Aaron Bentley]

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Marius Kruger wrote:
> Hi,
> I had a bzr problem which I annoyed me so much that I went ahead and
> fixed it:)

I think the desire is reasonable, but the implementation can be
improved.  Python comes with a shell-like parser already: shlex.split.
It preserves whitespace in quoted text.  So it would be good to use that
instead.

Please also include a test case to ensure that the behaviour you want
will not regress.  I can help you write that up, if you're not familiar
with it.

Aaron
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