chat: attachment sending: - files to send are not sent directly anymore, but added to attachment, and linked to the message when it is sent, this is more user friendly and avoid the accidental sending of wrong file - user can remove the attachment before sending the message, using the "close" symbol - new "Chat.addAtachment" method - upload progress is shown on the AttachmentItem thanks to the "progress" property - AttachmentItem stays in the attachments layout until uploaded or an error happens. Messages can still be sent while the item is being uploaded.

This directory include files backported from unreleased versions of Kivy until
they are actually released. Note that the LICENSE in this directory apply only
to this directory, other files follow general Cagou license specified in root
directory's COPYING (AGPL v3+).

The files here (except __init__.py) comes from Kivy repository (https://github.com/kivy/kivy) and are
copyrighted to their respective authors

"__init__.py" is part of Cagou and licensed under the same license (see root COPYING).