TF-80 Move multiple email to mailbox from thread view

model/lib/extensions/email_extension.dart

@@ -1,9 +1,16 @@
 
 import 'package:jmap_dart_client/jmap/mail/email/email.dart';
+import 'package:jmap_dart_client/jmap/mail/email/keyword_identifier.dart';
 import 'package:model/model.dart';
 
 extension EmailExtension on Email {
 
+  bool isUnReadEmail() => !(keywords?.containsKey(KeyWordIdentifier.emailSeen) == true);
+
+  bool isReadEmail() => keywords?.containsKey(KeyWordIdentifier.emailSeen) == true;
+
+  bool isFlaggedEmail() => keywords?.containsKey(KeyWordIdentifier.emailFlagged) == true;
+
   Set<String> getRecipientEmailAddressList() {
     final listEmailAddress = Set<String>();
     final listToAddress = to.getListAddress() ?? [];
@@ -22,6 +29,24 @@ extension EmailExtension on Email {
     );
   }
 
+  Email updatedEmail({Map<KeyWordIdentifier, bool>? newKeywords}) {
+    return Email(
+        id,
+        keywords: newKeywords ?? keywords,
+        size: size,
+        receivedAt: receivedAt,
+        hasAttachment: hasAttachment,
+        preview: preview,
+        subject: subject,
+        sentAt: sentAt,
+        from: from,
+        to: to,
+        cc: cc,
+        bcc: bcc,
+        replyTo: replyTo
+    );
+  }
+
   PresentationEmail toPresentationEmail({SelectMode selectMode = SelectMode.INACTIVE}) {
     return PresentationEmail(
       id,