Fixed newsletter includes when adding or editing (#2365)

refs https://github.com/TryGhost/Team/issues/1571

- When creating a new newsletter, the counts were not loaded
- When updating a newsletter, the counts were not updated
- Requires https://github.com/TryGhost/Ghost/pull/14696

ghost/admin/app/adapters/newsletter.js

@@ -9,6 +9,10 @@ export default class Newsletter extends ApplicationAdapter {
             parsedUrl.searchParams.append('opt_in_existing', 'true');
         }
 
+        if (snapshot?.adapterOptions?.include) {
+            parsedUrl.searchParams.append('include', snapshot?.adapterOptions?.include);
+        }
+
         return parsedUrl.toString();
     }
 }

ghost/admin/app/components/modals/newsletters/edit.js

@@ -49,7 +49,11 @@ export default class EditNewsletterModal extends Component {
 
             const newEmail = newsletter.senderEmail;
 
-            const result = yield newsletter.save();
+            const result = yield newsletter.save({
+                adapterOptions: {
+                    include: 'count.members,count.posts'
+                }
+            });
 
             if (result._meta?.sent_email_verification) {
                 yield this.modals.open(ConfirmNewsletterEmailModal, {

ghost/admin/app/components/modals/newsletters/new.js

@@ -44,7 +44,7 @@ export default class NewNewsletterModal extends Component {
             yield newsletter.validate({});
 
             const result = yield newsletter.save({
-                adapterOptions: {optInExisting: this.optInExisting}
+                adapterOptions: {optInExisting: this.optInExisting, include: 'count.members,count.posts'}
             });
 
             this.args.data.afterSave?.(result);