Fields sent from the client are pretty much always *text*. This can be
problematic for image fields sent as base64 *text* as in Python 3 the
base64 routines only work between bytes.
Alter the core field-resizing function (image_get_resized_images) such
that it ensures text base64 sources are encoded back to bytes before
being forwarded to the main resizing routines (which I don't think
should deal with *that* issue).
Fixes#18985: error when trying to update a company's logo
Purpose
=======
It makes no sense to crop an image from a ration. We don't say "I don't know my image size, but divide it by 2"
Specification
=============
Pass a maximum size argument instead of a thumbnail ratio
* StringIO removed from stdlib, replace with io
* try to correctly handle BytesIO/StringIO (one is for bytes the other
is for text)
* fix base64: Python 3 removed bytes-encoding and bytes-bytes
codecs (via #encode) so replace all calls to str.encode('base64'),
also b64encode is a bytes->bytes conversion so attempt to properly
handle that
issue #8530
Christophe Simonis