[issue20635] Fix the grid geometry manager and add tests for geometry managers

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Changesets 857ddbaff14e (2.7), 6227b0ecb5fb (3.3) and b6df5f8f86d3 (default).

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<http://bugs.python.org/issue20635>
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