[storages] fix fs_importing side-effect on entity.data When creating a new File object, if fs_importing is set, we want entity.data to be the file content instead of the filepath for the rest of the transaction. (see test_bfss_fs_importing_transparency) for test implementation To make this possible, the storage hooks (entity_added / entity_updated) must return the correct value to set in the entity dict.

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"""pre 3.6 bw compat"""

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# pylint: disable-msg=W0614,W0401

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from warnings import warn

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warn('moved to cubicweb.mail', DeprecationWarning, stacklevel=2)

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from cubicweb.mail import *