Read support for DataValidation

Issue #347 resolved
created an issue

I'm sure I raised this already but I can't find the issue anywhere, so just for the record:

If you create an XLSX file with Excel, adding a validation list to cell A1, for example, reading this in and then saving it back to disk removes the validation. It seems to be a problem with the reader.

Attached is a simple workbook. To reproduce the problem:

In [1]: import openpyxl

In [2]: wb = openpyxl.load_workbook('validation_list.xlsx')

In [3]:'validation_list_out.xlsx')

And see that A1 no longer has validation on it.

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