only change view mode for the current node (#104)

* only change view mode for the current node
* fix coder issue

islandora.module

@@ -257,7 +257,9 @@ function islandora_entity_view_mode_alter(&$view_mode, EntityInterface $entity)
   // ContextReaction.
   $storage = \Drupal::service('entity_type.manager')->getStorage('entity_view_mode');
   $context_manager = \Drupal::service('context.manager');
-
+  $current_entity = \Drupal::routeMatch()->getParameter('node');
+  $current_id = ($current_entity instanceof NodeInterface) ? $current_entity->id() : NULL;
+  if (isset($current_id) && $current_id == $entity->id()) {
     foreach ($context_manager->getActiveReactions('\Drupal\islandora\Plugin\ContextReaction\ViewModeAlterReaction') as $reaction) {
       // Construct the new view mode's machine name.
       $entity_type = $entity->getEntityTypeId();
@@ -273,7 +275,9 @@ function islandora_entity_view_mode_alter(&$view_mode, EntityInterface $entity)
       }
       else {
         // Otherwise, leave it be, but log a message.
-      \Drupal::logger('islandora')->info("EntityViewMode $machine_name does not exist.  View mode cannot be altered.");
+        \Drupal::logger('islandora')
+          ->info("EntityViewMode $machine_name does not exist.  View mode cannot be altered.");
+      }
     }
   }
 }