Commit 6494f51171 introduces an access token to read images inside an
email. This avoids access errors when accessing the email through a
proxy (e.g. Gmail). That implies that all images are added as
attachments.
When going through the usual media dialog, the form is submitted to
action '/web_editor/attachment/add', creating the attachment. However,
the copy or the drag and drop of an image completely fails. Indeed,
the same method `_onImageUpload` is called, but with a completely
different argument type: `attachments` is a `FileList`, not a list of
attachments.
To solve this, we only call `_onImageUpload` on a the custom `onUpload`
callback, which is not triggered during a drag and drop or a copy. Any
image included thanks to these methods will be post-processed in the
`create` method of `mail.message` (`base64_to_boundary`).
Unfortunately, it's not possible to simulate an actual drag and drop or
a copy, so we cannot add a test.
opw-1840237
opw-1840411
Nicolas Martinelli
5a1c789861