[web/views/formrenderer] do not use `cubicweb:target` attribute on form (closes #5534074)
The `cubicweb:target` is a flag indicating that the form data (with
file input) shall be posted inside an iframe - this is a well known
"ajax-like" workaround to post files with browsers that do not support
`FormData` (a.k.a IE<10).
The `cubicweb:target` was introduced when CW used the "xhtml strict"
doctype. Now that CW uses the "html5" doctype, this namespaced
attribute is no longer necessary and the iframe can be generated
directly.
Before this patch, CW inserts the `cubicweb:target` attribute in the
form DOM element (server side) and `setFormsTarget()` updates the
DOM with a new `<iframe>` element (client side).
Now, CW inserts the `<iframe>` DOM element directly (server side),
making `setFormsTarget` useless.
What's new in CubicWeb 3.17?
============================
New functionalities
--------------------
* add a command to compare db schema and file system schema
(see `#464991 <http://www.cubicweb.org/464991>`_)
* Add CubicWebRequestBase.content with the content of the HTTP request (see #2742453)
(see `#2742453 <http://www.cubicweb.org/2742453>`_)
* Add directive bookmark to ReST rendering
(see `#2545595 <http://www.cubicweb.org/ticket/2545595>`_)
* Allow user defined final type
(see `#124342 <https://www.logilab.org/ticket/124342>`_)
API changes
-----------
* drop typed_eid() in favour of int() (see `#2742462 <http://www.cubicweb.org/2742462>`_)
* The SIOC views and adapters have been removed from CubicWeb and moved to the
`sioc` cube.
* The web page embedding views and adapters have been removed from CubicWeb and
moved to the `embed` cube.
* The email sending views and controllers have been removed from CubicWeb and
moved to the `massmailing` cube.
* ``RenderAndSendNotificationView`` is deprecated in favor of
``ActualNotificationOp`` the new operation use the more efficient *data*
idiom.
* Looping task can now have a interval <= ``0``. Negative interval disable the
looping task entirely.
* We now serve html instead of xhtml.
(see `#2065651 <http://www.cubicweb.org/ticket/2065651>`_)
Deprecation
---------------------
* ``ldapuser`` have been deprecated. It'll be fully dropped in the next
version. If you are still using ldapuser switch to ``ldapfeed`` **NOW**!
* ``hijack_user`` have been deprecated. It will be dropped soon.
Deprecated Code Drops
----------------------
* The progress views and adapters have been removed from CubicWeb. These
classes were deprecated since 3.14.0. They are still available in the
`iprogress` cube.
* API deprecated since 3.7 have been dropped.