When uploading an image as attachment, the document viewer doesn't
support the EXIF data. Therefore, a picture taken with a non-zero angle
will not appear with the right orientation (preview or full-size image).
Unfortunately, supporting EXIF data is not trivial in Python or
JavaScript without external libraries. Therefore, we add a rotate button
which allows the user to rotate the image by 90°. Moreover, we add the
`image-orientation: from-image` CSS property, which is only supported by
Firefox.
opw-1814407
Nicolas Martinelli
e2c2a2fc69