Open within the viewer several documents from a list

User story
As a user, I can select several documents from a list (search result, folderish documents list,...) and open them within the Nuxeo Enhanced Viewer, in order to display several documents at once, navigate through each of them and annotate each of them, so that I can increase my productivity.

Description
The goal is to take benefits of the Arender capabilities regarding the display of several files at once in the same viewer.
To do so, the idea is to have an action available on all list of documents to open within the viewer the selected documents in the Nuxeo Enhanced Viewer:

Then, in Arender, the user can see all the documents he selected:

This action has to be available on the following list of documents:

• Search results,
• All folderish documents list of content (folders, sections, domains,...),

Acceptance criteria
Acceptance criteria 1
Given I did a search with at least 2 results containing a main file content,
When I select at least 2 documents with main file content,
And I click on “View selected documents”,
Then I’m redirected to Arender view,
And all the selected documents are displayed one after the other on the viewer,
And I can navigate through each document,
And I can annotate each of the documents.

Acceptance criteria 2
Given I go to a folder with at least 2 results containing a main file content,
When I select at least 2 documents with main file content,
And I click on “View selected documents”,
Then I’m redirected to Arender view,
And all the selected documents are displayed one after the other on the viewer,
And I can navigate through each document,
And I can annotate each of the documents.

Acceptance criteria 3
Given I did a search returning 2 documents containing a main file content and 1 document without a main file content,
When I select the 3 documents,
And I click on “View selected documents”,
Then I’m redirected to Arender view,
And the 2 documents containing a main file content are displayed one after the other on the viewer,
And the document without main file content is not displayed nor mentioned in the view.

Acceptance criteria 4
Given I did a search returning at least 1 document containing a main file not supported by Arender Viewer,
When I select several documents including the one with a not supported file,
And I click on “View selected documents”,
Then I’m redirected to Arender view,
And the documents containing a supported main file content are displayed one after the other on the viewer,
And the document with unsupported main file content is not displayed nor mentioned in the view.