* Also check children of a mutated element to activate placeholder.

[Misc] Trying to debug the "ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock'" error

[Misc] Start docker-latest jobs at 10PM to give me more time during the night so that by the morning they're done

  * Fix default priority for notifications.

  * Define an AsyncNotificationRendererJobInitializer that is a
    GroupedJobInitializer which defines the size of the pool and the
thread priority
  * Overrides the getJobGroupPath in DefaultAsyncNotificationRenderer to
    use the same one as the AsyncNotificationRendererJobInitializer
  * Put new configurations for REST poolSize and Async poolSize in
    NotificationConfiguration and describe them in xwiki.properties
  * Use directly NotificationConfiguration in REST
    NotificationEventExecutor
  * Use NotificationConfiguration async pool size in
    AsyncNotificationRendererJobInitializer.

XWIKI-17336: Allow the async rendering framework to limit the pool of threads based on AsyncRenderer type

  * Allow to specify a JobGroupPath in an AsyncRenderer which can be
    used with a GroupedJobInitializer to specify the number of threads
to use in the pool.

  * Describe new available properties.

- instead of adding a separate filter preference for the subwiki
  make sure the reference to pages and spaces are absolute
  by prefixing them with the "currentWiki"
- only in the case where no location parameters are given and
  we are in a subwiki add an explicit wiki filter
- for this add the "currentWiki" back in the data-set
  generated by the notifications macro
- also added "toString()" methods to a few classes
  which helped in debugging the unit tests
- made "toString()" methods conforming to code style
- move the code to a separate helper method, which checks for the special
  case of being in a subwiki and having no location filters defined
  so one needs to an explicit filter to limit the resuts to the current wiki

XWIKI-17380: Subwikis are created with wrong charset/collation and cannot be deleted when using the "com.mysql.cj.jdbc.Driver" driver class

* Remove leftover import breaking the build

  * Small refactorings after @vmassol's review.

* Load diff.js
* Reload the editor when the document is saved with merge
* Better handling of failed HTTP requests (always try to unlock and get back to view)

  * Display back the wiki name in notifications
  * Small refactoring on NotificationsDisplayerUIX to avoid parsing
    notification panel header with wiki syntax.

* Added new resolveExtraJARs @UITest property to control the resolving of missing versions or not

  * Fix checkstyle

   * Edit query in NotificationUserIterator to only select active users
   * Improve unit test to validate the query performed

  * Add missing revapi ignores
  * Fix test problem

  * Fix javadoc error.

  * Add new method in store for atomic rename
  * Move methods from XWikiDocument to XWiki for rename
  * Use a fallback on old copyAndDelete rename if the option to use
    atomic rename is not set to true as a security measure
  * Move XWikiDocumentTest#rename to XWikiTest and test both new and old
    rename
  * Update refactoring to use a real rename method and not copy/delete.
  * Document new option to switch off atomic rename if needed.
  * Change the way XWikiSpace are loaded in HibernateStore and adapt the
    class to allow setting its store.
  * Move old deprecated rename methods using strings to legacy
  * Create new utility methods in Document API that uses references
    instead of String for backlinks and children
  * Create a new scenario for moving a page to a subwiki.