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

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

My fault. I tested the patch with 8.5 and 8.6, but was too lazy to check it with 8.4. Here is updated patch with workarounded 8.4 peculiarities.

I'm not sure about test_place_forget(). I have removed the check, hope this will help.

Thank you Ned.

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Added file: http://bugs.python.org/file34105/test_geometry_managers_2.patch

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