(cherry picked from commit eb581d42)

XWIKI-22351: The autosave triggers a merge conflict sometimes even if there's no save done outside the realtime session
* When replacing empty paragraphs with empty lines, take into account the CKEditor temporary elements (like the hidden selection) when determining if an empty paragraph is at the start / end of the edited content, otherwise we get conflicts in the realtime session (e.g. because the widget selection is not synchronized and so some users will have the hidden selection element while others won't)
* Disable the action buttons while an action takes place (e.g. saving) in order to avoid triggering the same action multiple times
* Rewrite the realtime auto-saver to improve the synchronization between clients when saving or handling merge conflicts

(cherry picked from commit 62264aed)

Co-authored-by: Clemens Robbenhaar <c.robbenhaar@green-meadows.de>

  * Fix a possible issue when loading the tree

(cherry picked from commit 5c8a3d5e)

See also https://jira.xwiki.org/browse/XWIKI-22533

(cherry picked from commit 41879e6a)

* Improve the math to achieve a scaling factor that leads exactly to the
  desired width.
* Adjust the integration test to expect the new default image size.

(cherry picked from commit e3c4bea8)

* Add a new API to URLSecurityManager that allows specifying the
  request domain instead of reading it from the context.
* Use this API to check the redirect URL in the request parameter
converter filter.
* Add tests.

(cherry picked from commit 6dab7909)

  * Ensure to use the defined name strategy before providing a link
    default value when selecting a text

(cherry picked from commit 7c1fa96c)

* Convert to PDF and extract images from the PDF
* Adapt the unit test
* Change the output format to PNG
* Change the default image format back to JPEG.
* Read the old office converter configuration for size and quality.
* Add new configuration options for format, quality and image size.
* Revert "[Misc] Force using old version of LO until XWIKI-22335 is done"
* Revert "[Misc] Revert LO upgrade because of XWIKI-22335"
* Fix existing comments in DefaultPresentationBuilder
* Provide new properties in xwiki.properties
* Fallback in document-formats.js in case custom-document-formats is
    not used for backward compatibility
* Provide unit test
* Improve a bit ServletContainerExecutor to have better understanding
    in case of error when building LO image

This reverts commit 29e45435.
This reverts commit f19ea82a.
This reverts commit 32a20ae0.

---------

Co-authored-by: Simon Urli <simon.urli@xwiki.com>
(cherry picked from commit acd6ed3f)

(cherry picked from commit 89ba9eae)

(cherry picked from commit c92ad8ae)

* fix wrong since
* fix two mistakes
* add unit tests

Currently translated at 100.0% (283 of 283 strings)

Translation: XWiki Platform/XWiki Platform - CKEditor - UI
Translate-URL: https://l10n.xwiki.org/projects/xwiki-platform/xwiki-platform-ckeditor-ui/de/

* Always use secure() (thanks to Thomas)

  * Improve translations

  * Fix download URL for LO

* Add fr_FR, fr_BE, and de_DE to the locales supported by Solr.
* Add page objects for search results.
* Add an integration test that checks that search results in the added
  locales work.

  * Upgrade some dependencies

* Make sure that the 2 builds are executed on the same node, one after another (since the 2nd one depends on the 1st one)