Change record status: 
Project: 
Introduced in branch: 
9.1.x
Introduced in version: 
9.1.0
Description: 

The \Drupal\layout_builder\Element\LayoutBuilder element now dispatches LayoutBuilderEvents::PREPARE_LAYOUT event while preparing the element during #pre_render. This will allow for other modules to interact with the SectionStorageInterface $section_storage object (see \Drupal\layout_builder\Event\PrepareLayoutEvent::getSectionStorage()).

Read this documentation for how to subscribe to the LayoutBuilderEvents::PREPARE_LAYOUT event.

The default priority of the existing functionality is set to 10 to make it easy to act either before or after the core event listener.

Impacts: 
Module developers