Change record status: 
Project: 
Introduced in branch: 
8.x-1.x
Introduced in version: 
8.x-1.5
Description: 

For type hinting purposes, and because the plugin manager service for search display plugins adds a new public method (getInstances()), we added \Drupal\search_api\Display\DisplayPluginManagerInterface as its interface and used that in type hinting.

Other module's code is only affected if it overrides the search display plugin manager (although existing type hints for DisplayPluginManager should also be adjusted, as soon as there is a new release for the Search API module).

Impacts: 
Module developers