XWIKI-22917: Solr indexing takes very long when there are many objects with different values (#3923)

* Use a HashSet to compute unique values instead of a linear search.
* Rename LengthSolrInputDocument to XWikiSolrInputDocument.
* Use XWikiSolrInputDocument in more places to use the new method.
* Add a unit test for XWikiSolrInputDocument.

(cherry picked from commit 39e2c7ff)

XWIKI-22583: Allow users with edit rights on a page and all its children to use the Pinned Pages feature

  * Fix flickering test

(cherry picked from commit 0b95939a)

  * Fix flickering test

(cherry picked from commit 93fafb7d)

XWIKI-22926: Make it possible to configure the batch size in the Solr index synchronization on startup (#3928)

* Add a new configuration property for configuring the batch size of the
  initial Solr indexing synchronization.
* Update and add tests.

(cherry picked from commit db2814b6)

(cherry picked from commit fa46bfe8)

* Don't do a linear search for finding the object with the correct number.

(cherry picked from commit 1bf17199)

XWIKI-22898: The macro placeholder is visible when inserting the Children macro from the in-place WYSIWYG edit mode

  * Fix failing test

(cherry picked from commit e19c39b1)

* Fix trim being applied to the wrong value.

(cherry picked from commit 56158106)

(cherry picked from commit ba6d468c)

  * Revert changes related to aria-hidden and tabsindex: we want user to
    be still able to use keyboard to pin/unpin pages

(cherry picked from commit 3ca4f633)

XWIKI-22583: Allow users with edit rights on a page and all its children to use the Pinned Pages feature (#3900)

*  Provide a REST API to manipulate pinned pages with Edit right only
* Provide an index script service and an index.tree script service to manipulate pinned pages
* Provide tabs in children viewer with a UIXP
* Use the UIXP to inject capability to configure pinned pages reusing the navigation panel administration UI
* Provide new integration test

(cherry picked from commit aaf345bb)

(cherry picked from commit dcdd441c)

(cherry picked from commit 8e9d9225)

(cherry picked from commit f050e52f)

(cherry picked from commit 18aa48cf)

XWIKI-22813: Create User dialog no longer automatically suggests username based on first and last names (#3906)

* Reverted the form field order to what used to be.

(cherry picked from commit 340e8c92)

* Improve the code that scrolls the selection into view.

XWIKI-22898: The macro placeholder is visible when inserting the Children macro from the in-place WYSIWYG edit mode
* Update the macro placeholder visibility on xwiki:dom:updated.

* Solved the unlabelled button issue.
* Solved the anauthorized role final node issue.

(cherry picked from commit 1f8019f2)

- Replace & with && in if
- Remove superfluous generics definitions
- Use new API for maps manipulation

(cherry picked from commit 805e91db)

Co-authored-by: Manuel Leduc <manuel.leduc@xwiki.com>

* Ensure that the specified fields are actually valid field names
* Don't allow password and email fields
* Add tests

(cherry picked from commit f2ca8649)
(cherry picked from commit e1a81189)

  * Fix javadoc

(cherry picked from commit 5bd54373)

* bulletproof the argument displayer to catch any exception
* use a more reliable way to identify object types

(cherry picked from commit 863e5f54)

  * Ensure to always send an empty value so that it's always an array
    sent to the server

(cherry picked from commit 66ca574f)

(cherry picked from commit 542b1243)

(cherry picked from commit fc7b7943)

* Updated the style of the `edit all objects` link to behave as expected. This means removing customizations that were made to fit a CSS only icon.
* Added back a cross in the `remove deprecated property` link.

(cherry picked from commit 5ebabfc4)

* Merging consecutive PDF link annotations with the same target doesn't make sense all the time (this PO is used to test the old PDF export as well).

* improve internal API

(cherry picked from commit dcc9ac20)

* fix test

(cherry picked from commit 6984a161)

* fix XWikiDocument#getXClass() causing the document to become dirty on Oracle

(cherry picked from commit 0549a826)

* Treat stylesheets loaded from a different domain as missing because paged.js fails to load them anyway without recoving (blocking the PDF export). We'll have to rollback this changed once https://github.com/pagedjs/pagedjs/issues/267 is fixed.

(cherry picked from commit 92df84a3)

[stable-16.10.x] XWIKI-22782: Only save modified xobjects (#3899)