TF-3804 Thread Detail Load selected email in parallel with thread metadata

lib/features/thread_detail/presentation/utils/thread_detail_presentation_utils.dart

@@ -1,7 +1,9 @@
 import 'dart:math';
 
+import 'package:collection/collection.dart';
 import 'package:flutter/material.dart';
 import 'package:jmap_dart_client/jmap/mail/email/email.dart';
+import 'package:model/email/presentation_email.dart';
 
 class ThreadDetailPresentationUtils {
   const ThreadDetailPresentationUtils._();
@@ -54,4 +56,38 @@ class ThreadDetailPresentationUtils {
       emailIds.length,
     );
   }
+
+  static List<EmailId> refreshEmailIds({
+    required List<EmailId> original,
+    required List<EmailId> created,
+    required List<EmailId> destroyed,
+  }) {
+    return [
+      ...original.whereNot(destroyed.contains),
+      ...created,
+    ];
+  }
+
+  static List<PresentationEmail> refreshPresentationEmails({
+    required List<PresentationEmail> original,
+    required List<PresentationEmail> created,
+    required List<PresentationEmail> updated,
+    required List<EmailId> destroyed,
+  }) {
+    return [
+      ...original
+        .whereNot((email) => destroyed.contains(email.id))
+        .map((email) {
+          final updatedInOriginal = updated.firstWhereOrNull(
+            (updatedEmail) => updatedEmail.id == email.id,
+          );
+
+          return email.copyWith(
+            keywords: updatedInOriginal?.keywords,
+            mailboxIds: updatedInOriginal?.mailboxIds,
+          );
+        }),
+      ...created,
+    ];
+  }
 }