Handle the behaviour of Reply/ReplyToList/ReplyAll button

Signed-off-by: dab246 <tdvu@linagora.com>

model/lib/extensions/email_extension.dart

@@ -36,9 +36,7 @@ extension EmailExtension on Email {
 
   String get sMimeStatusHeaderParsed => sMimeStatusHeader?[IndividualHeaderIdentifier.sMimeStatusHeader]?.trim() ?? '';
 
-  String get listPost => headers.listPost;
-
-  bool get hasListPost => listPost.isNotEmpty;
+  String get listPost => headers.listPost.trim();
 
   IdentityId? get identityIdFromHeader {
     final rawIdentityId = identityHeader?[IndividualHeaderIdentifier.identityHeader];

model/lib/extensions/list_email_address_extension.dart

@@ -83,4 +83,17 @@ extension ListEmailAddressExtension on List<EmailAddress> {
 
     return where((emailAddress) => emailAddress.emailAddress != userName).toList();
   }
+
+  List<EmailAddress> removeDuplicateEmails() {
+    final seenEmails = <String>{};
+    return where((emailAddress) {
+      if (emailAddress.emailAddress.isEmpty ||
+          seenEmails.contains(emailAddress.emailAddress)) {
+        return false;
+      } else {
+        seenEmails.add(emailAddress.emailAddress);
+        return true;
+      }
+    }).toList();
+  }
 }