Do not access form submission REQUEST from the listbox list method,
as it is rendered asynchronously in ERP5JS

This reverts commit 35b2c024.

Allow edition in the new UI

This make everything slow as hell and prevent to quickly save.

Example: <h2 class="foo">bar</h2> => <h3 class="foo">bar</h3>

Changing the language and browsing to another web section require to fully refresh the page.

This breaks the previous gadget API.

Previously available at https://nexedi.erp5.net/web_page_module/3487.

So that it can be registered properly on load and later added through the ZMI.

ZODB Components: Tool Component: Only validated 'reference' must be considered when registering a Tool.

Otherwise setting an invalid reference will make the Component 'modified' but
try to use that invalid reference to register it and fail.

With chrome ( 85.0.4183.108 but I think it appears a few weeks/months ago )
when using erp5_xhtml_style when the cursor in the first column on the left
it's not visible, because the bold background hides it.

Default user agent spreadsheet is a 2px padding, but we have a rule applying a
padding 0 for all textarea. Revert this rule for textarea used as fields in
content.


---

## before:

The cursor is in *Description* field, left to "This style is ..." but cannot be seen.

![image](/uploads/f40262af196d799291643604b91ae2c4/image.png)


## after:

The cursor is same location (*Description* field, left to "This style is ...") and this time is visible.

![image](/uploads/bf1ec63532e2eca1fca7655a4581935a/image.png)

See merge request nexedi/erp5!1280

See merge request nexedi/erp5!1282

Previously this would be rendered as empty String
(unless we had a hidden field to define precision)

Commit adds also testListboxZeroValue in  erp5_web_renderjs_ui_test

See merge request nexedi/erp5!1173

See merge request nexedi/erp5!1262