PLIP: New feature hide and show Volto blocks

[SaraBianchi]

PLIP (Plone Improvement Proposal)

Responsible Persons

Proposer: Sara Bianchi @SaraBianchi

Seconder: Giulia Ghisini @giuliaghisini

Abstract

New feature to hide or show blocks in view from the editor editing mode.

Motivation

Some customers have expressed the need to set up temporary blocks that will be activated or deactivated as needed.
A real use case could be to set up a block with a link to a YouTube live video that will be activated only when there is a session/conference.

Assumptions

Proposal & Implementation

In the Volto EditBlockWrapper, a button with an icon (eye/crossed-out eye) has been added to the center and top of the wrapper to hide or show a certain block. In addition to this, a button has also been added to the left side toolbar (above the Undo/Redo buttons) to switch to "Show hidden blocks too" mode or to collapse them to make the page preview functional.
More wrap layout details on the pull request.

Deliverables

The feature was requested in Volto version 17, but if it works we may open a pr for Volto main as well. Other packages were not affected.
This feature is quite urgent.

Risks

As explained in the pr, there is a risk of getting stuck inside collapsed blocks if you press the DEL button while moving from the keyboard, possible improvements can be managed in Slate type blocks, where it will be necessary to specify that if there are previously hidden blocks they must be bypassed.

Participants

Piero Nicolli @pnicolli participated in the review and exposition of the functionality already proposed in the past by me (@SaraBianchi).

Pull Request

Old closed pr: #5157
Open pr: #6556