Issue #3279527 by phenaproxima, tedbow: Ensure plugins are reloaded after an update

<?php

namespace Drupal\updated_module\Plugin\Block;

use Drupal\Core\Block\BlockBase;

/**

 * This block is removed from version 1.1.0 of this module.

 *

 * @Block(

 *   id = "updated_module_deleted_block",

 *   admin_label = @Translation("Deleted block"),

 * )

 */

class DeletedBlock extends BlockBase {

  /**

   * {@inheritdoc}

   */

  public function build() {

    return [

      '#markup' => $this->t('Goodbye!'),

    ];

  }

}

<?php

namespace Drupal\updated_module\Plugin\Block;

use Drupal\Core\Block\BlockBase;

/**

 * Defines a block plugin to test plugin reloading during an update.

 *

 * This block should NOT be loaded before updating to version 1.1.0 of this

 * module.

 *

 * @Block(

 *   id = "updated_module_ignored_block",

 *   admin_label = @Translation("1.0.0")

 * )

 */

class IgnoredBlock extends BlockBase {

  /**

   * {@inheritdoc}

   */

  public function build() {

    return [

      '#markup' => $this->t("I should not be instantiated before the update."),

    ];

  }

}

<?php

namespace Drupal\updated_module\Plugin\Block;

use Drupal\Core\Block\BlockBase;

/**

 * Defines a block plugin to test plugin reloading during an update.

 *

 * In version 1.1.0 of this module, this block exists but its plugin definition

 * and implementation are different.

 *

 * @Block(

 *   id = "updated_module_updated_block",

 *   admin_label = @Translation("1.0.0")

 * )

 */

class UpdatedBlock extends BlockBase {

  /**

   * {@inheritdoc}

   */

  public function build() {

    return [

      '#markup' => $this->t('1.0.0'),

    ];

  }

}

<?php

namespace Drupal\updated_module\Plugin\Block;

use Drupal\Core\Block\BlockBase;

/**

 * This block doesn't exist in version 1.0.0 of this module.

 *

 * @Block(

 *   id = "updated_module_added_block",

 *   admin_label = @Translation("Added block"),

 * )

 */

class AddedBlock extends BlockBase {

  /**

   * {@inheritdoc}

   */

  public function build() {

    return [

      '#markup' => $this->t('Hello!'),

    ];

  }

}

<?php

namespace Drupal\updated_module\Plugin\Block;

use Drupal\Core\Block\BlockBase;

/**

 * Defines a block plugin to test plugin reloading during an update.

 *

 * This block should only be loaded and built after updating to version 1.1.0 of

 * this module.

 *

 * @Block(

 *   id = "updated_module_ignored_block",

 *   admin_label = @Translation("1.1.0")

 * )

 */

class IgnoredBlock extends BlockBase {

  /**

   * {@inheritdoc}

   */

  public function build() {

    return [

      '#markup' => $this->t('I was ignored before the update.'),

    ];

  }

}