Fix missing language context

Problem/Motivation

Language context missing in Block Deriver definition.


As we were updating our site from 8.9 to 9.2.7 we noticed this module was throwing the following exception:

Drupal\Component\Plugin\Exception\ContextException: Assigned contexts were not satisfied: language in Drupal\Core\Plugin\Context\ContextHandler->applyContextMapping() (line 145 of /DRUPAL_ROOT/core/lib/Drupal/Core/Plugin/Context/ContextHandler.php).

So, we needed to dig in and fix the problem because this exception was blocking the rendering of our content.

Steps to reproduce

Simply enable this module for one of your content types under Drupal 9.2.x environment, and try to view/render it, you should have the aforesaid exception.

Proposed resolution

The problem we found is the missing language context on the deriver class (src/Plugin/Derivative/TextLongFieldTocBlockDeriver.php) on the getDerivativeDefinitions method. We had to add the language context using the context repository service.

Remaining tasks

We should also considere to replace the context entry on @Block annotation under src/Plugin/Block/TextLongFieldTocBlock.php with context_definitions since it was deprecated since Drupal 8.7

User interface changes

None

API changes

None

Data model changes

None