* Add missing optional chaining operator

  * Refactor NotificationFilterPreferenceStore to ensure to use the
    right wiki in context when the local store is used
  * Use a query based on the filter internal identifier to perform
    single deletion, to prevent having to load it
  * Refactor the way NotificationFilterPreferenceDeletedEvent is used to
    not send the entire filter instance when it's triggered
  * Improve unit tests

* Fix column title width using a min-width in CSS.

XWIKI-21318: Add support for displaying metadata from the exported pages in the PDF header or footer
* clean imports

* Fixed a selector for the viewpage background

Currently translated at 100.0% (4467 of 4467 strings)

Translation: XWiki Platform/XWiki Core Resources
Translate-URL: https://l10n.xwiki.org/projects/xwiki-platform/xwiki-core-resources/de/

Currently translated at 100.0% (10 of 10 strings)

Translation: XWiki Platform/xwiki-platform-search-solr-ui-admin
Translate-URL: https://l10n.xwiki.org/projects/xwiki-platform/xwiki-platform-search-solr-ui-admin/ru/

Currently translated at 20.0% (2 of 10 strings)

Translation: XWiki Platform/xwiki-platform-search-solr-ui-admin
Translate-URL: https://l10n.xwiki.org/projects/xwiki-platform/xwiki-platform-search-solr-ui-admin/ru/

Currently translated at 100.0% (5 of 5 strings)

Translation: XWiki Platform/Extension - Security - Index
Translate-URL: https://l10n.xwiki.org/projects/xwiki-platform/extension-security-index/ru/

Currently translated at 100.0% (73 of 73 strings)

Translation: XWiki Platform/PDF Export UI
Translate-URL: https://l10n.xwiki.org/projects/xwiki-platform/pdf-export-ui/ru/

Currently translated at 100.0% (73 of 73 strings)

Translation: XWiki Platform/PDF Export UI
Translate-URL: https://l10n.xwiki.org/projects/xwiki-platform/pdf-export-ui/de/

Currently translated at 100.0% (48 of 48 strings)

Translation: XWiki Platform/Image Style UI
Translate-URL: https://l10n.xwiki.org/projects/xwiki-platform/image-style-ui/ru/

Currently translated at 100.0% (277 of 277 strings)

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

Currently translated at 100.0% (20 of 20 strings)

Translation: XWiki Platform/Mentions UI
Translate-URL: https://l10n.xwiki.org/projects/xwiki-platform/mentions-ui/ru/

Currently translated at 100.0% (116 of 116 strings)

Translation: XWiki Platform/XWiki.AdminTranslations.xml
Translate-URL: https://l10n.xwiki.org/projects/xwiki-platform/xwiki-admintranslations-xml/ru/

Currently translated at 100.0% (4467 of 4467 strings)

Translation: XWiki Platform/XWiki Core Resources
Translate-URL: https://l10n.xwiki.org/projects/xwiki-platform/xwiki-core-resources/ru/

* Hopefully better fix for breadcrumb/main content spacing.
* Remove margin from .xcontent as it is now visible while before it was
  collapsed.
* Fix print style of breadcrumb.
* Remove the breadcrumb from the main content in the create template.
* Fix breadcrumb when nested inside the main content as in the admin
  sheet.

XWIKI-18838: Use ARIA landmarks for main page regions

* bulletproofing
* improve test

* Fixed a mainContentArea that did not get its element nature changed

* Fixed page objects selectors to take into account the change to the nature of the mainContentArea node.

* Added a navigation element wrapping the hierarchy element (accessible name, escaped and localized)
* Updated style to avoid the white border under the page content
* Updated the view template to avoid style issues with secondary viewers
* Removed unwanted shadow from the hierarchy_breadcrumb

XWIKI-21318: Add support for displaying metadata from the exported pages in the PDF header or footer
* Render the metadata property in the context of the rendered document so we don't need the 'sourceDocument' binding
* Apply the metadata to single-page exports also
* Remove unused code (leftover from when the PDF export was done without a server-side job); this also simplifies the PDF template

Currently translated at 100.0% (73 of 73 strings)

Translation: XWiki Platform/PDF Export UI
Translate-URL: https://l10n.xwiki.org/projects/xwiki-platform/pdf-export-ui/de/

Currently translated at 100.0% (277 of 277 strings)

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

Currently translated at 100.0% (48 of 48 strings)

Translation: XWiki Platform/Image Style UI
Translate-URL: https://l10n.xwiki.org/projects/xwiki-platform/image-style-ui/de/

Currently translated at 100.0% (116 of 116 strings)

Translation: XWiki Platform/XWiki.AdminTranslations.xml
Translate-URL: https://l10n.xwiki.org/projects/xwiki-platform/xwiki-admintranslations-xml/de/

* Updated test selector for the page background in regards to the changes in layout.less