Create new revision when a view override is published

Problem/Motivation

When publishing a display update from an entity view override, we are saving the content entity, but not creating a new revision.

Example:

1. Make a content type (node bundle) display overridable with Display Builder
2. Override the by doing some changes here: /node/1/display/default
3. Check the changes: /node/1
4. Check if a revision has been added: /node/1/revisions

Proposed resolution

I have tried a simple change like that:

--- a/modules/display_builder_entity_view/src/Field/DisplayBuilderItemList.php
+++ b/modules/display_builder_entity_view/src/Field/DisplayBuilderItemList.php
@@ -173,7 +173,11 @@ final class DisplayBuilderItemList extends MapFieldItemList implements DisplayBu
     foreach ($data as $offset => $item) {
       $this->list[$offset] = $this->createItem($offset, $item);
     }
-    $this->getEntity()->save();
+    $entity = $this->getEntity();
+    if ($entity->getEntityType()->isRevisionable()) {
+      $entity->setNewRevision();
+    }
+    $entity->save();
   }

But I am not sure it works. Anyway, it must not be more complicated than that. Maybe the problem is the way we are updating the field value.