Remove WYSIWYG options for page description

[Kristina Hoeppner]

In the past when the layout was not very flexible and we didn't have rows (i.e. a veeeeery long time ago), the page description text field was an important part of a page as it allowed people to create a section across an entire page of Mahara and use it as style element. People created banners in there and needed to have styling options available. That's why it has a visual editor with all the editing options.

Now (well, for quite some time already actually) that we have a more flexible layout, we do not need this area anymore to style a page with. It also added to the confusion for some people as they thought that was the area where they would add their content.

While the page description is shown on a page, the collection description is ignored (this may be a regression, but is OK).

Since we have the "tiles" on "Pages and collections", the description shows up in the tile and is often cut off when it is too long and banners are not displayed in there either.

I propose the following:

1. Remove the visual editor from the page description.
2. Limit the number of characters for the page and collection description to 140 characters. That seems to fit in there (with our current font size).
3. For existing sites, move the current page description content of pages to the first block on the page that goes across the entire width of the page and doesn't have a block heading. That way, the content is still displayed for pages that are used to displaying it, especially if the page uses the description as content styling element.

[Kristina Hoeppner (kris-hoeppner)]

We would need to consider:

- "Old pages" that haven't yet been translated into the new Gridstack layout and that a person is not going to edit. The "old layout" would need to be extended by 1 row that goes across the entire page above all other rows (in 18.10 we increased the row limit to 20).
- "Old pages" that are being migrated to Gridstack.
- Pages that are already on the new Gridstack layout -> add a text block of page width above all other blocks and push those down.

[Mahara Bot (dev-mahara)]

Patch for "master" branch: https://reviews.mahara.org/10742

[Mahara Bot (dev-mahara)]

Reviewed: https://reviews.mahara.org/10742
Committed: https://git.mahara.org/mahara/mahara/commit/500d91796bef507f115dce007fe6eb9e43b58f0c
Submitter: Robert Lyon (<email address hidden>)
Branch: master

commit 500d91796bef507f115dce007fe6eb9e43b58f0c
Author: Cecilia Vela Gurovic <email address hidden>
Date: Fri Jan 31 15:59:04 2020 +1300

Bug 1857382: Removing page description tinymce editor

and replace the editor with a textarea to edit the description

For views already on the site that have descriptions:
- If they can be transform to a simple text, then remove the html
tags from the view description to make it a simple text and
update the DB with it.
- If the description has tables, lists, etc, then create
a text block with that description and place it above
the other blocks of the view.

upgrade: only remove description for new layout pages
and the description must be:
- more than 160 characters long
or
- have styling tags other than <p>, <em>, <br>

translating pages: if the description makes one of the
two conditions true, then create a new block at the top
of the page with it. If not, if it's a simple short text
then leave it as the view description.

import:
- for new gridstaxc layout pages, add a block at the top if needed.
- for old layout, the page will be translated. After this, we
add a block if needed

copy a page:
- if it has new gridstack layout, it was fixed by the upgrade,
so we don't need to do anything
- if it has old layout, the new view will be translated and
we add a new text bloxk at the top with the description if needed

CHECK what to do
- the site templates, Dashboard and profile pages have descriptions
So do the copies for each user.
But those description don't show when viewing a portfolio or a dashboard.
And the user can't change the settings for those pages either.
old pages not translated: display a new block at the top of the page.
There's no change in the layout on the db, there will be a mock block
at the top of the page

behatnotneeded
Change-Id: I7646405a786e823ae486cc325c30b7a713deccee