UPGRADE.md

INTRODUCTION

This document describes how to update your theme when the theme changes.

8.x-4.x -> 8.x-5.x

For Drupal 9, the new base theme is stable9 instead of stable. The site must enable stable9 when upgrading the theme to 8.x-5.x versions. Unfortunately there is no way to provide an update hook in a theme.

8.x-4.13 -> 8.x-4.14

Contextual links This theme provided contextual links for ds entity view display modes. For Drupal 9, a pre_render call must be a method in a class that implements \Drupal\Core\Security\TrustedCallbackInterface. To allow this theme to be installed on Drupal 9 platform, the contextual links were removed. If it is desired to have those links, create a class that implements TrustedCallbackInterface and follow the documentation for that on drupal.org.