Autocomplete widget doesn't work on entity labels without a " (entity_id)" suffix

Heh, just when I thought we had good coverage for our widgets :/

1. +++ b/core/modules/entity_reference/lib/Drupal/entity_reference/Plugin/entity_reference/selection/SelectionBase.php
   @@ -220,7 +220,11 @@ public function validateReferenceableEntities(array $ids) {
   +    foreach($bundled_entities as $entities_list) {
   

   Missing a space here :)

2. +++ b/core/modules/entity_reference/lib/Drupal/entity_reference/Plugin/entity_reference/selection/SelectionBase.php
   @@ -220,7 +220,11 @@ public function validateReferenceableEntities(array $ids) {
   +      $entities = $entities_list;
   

   Shouldn't this be += ?

3. --- a/core/modules/entity_reference/lib/Drupal/entity_reference/Tests/EntityReferenceSelectionAccessTest.php
   +++ b/core/modules/entity_reference/lib/Drupal/entity_reference/Tests/EntityReferenceSelectionAccessTest.php
   

   This class tests something else entirely, all the widget tests are in EntityReferenceIntegrationTest ;)

2. Those aren't entity types, they are bundles. Like article and page. We explicitly want to merge them together, not drop them as you do right now.

I think it would be much easier to test this by updating the input values inserted a few lines above in that method. Something like this interdiff :)

Test coverage looks good to me. I worked on the initial patch in the 7.x issue but I think @amateescu would have said something if the fix wouldn't be OK :)

6: autocomplete_ref_fix-2247211-6.patch queued for re-testing.

Bot fluke, back to RTBC.

Reroll for #2247991: [May 27] Move all module code from …/lib/Drupal/… to …/src/… for PSR-4.

Committed 6e7dfbc and pushed to 8.x. Thanks!