Fix display block quoted content in composer

model/lib/extensions/list_email_content_extension.dart

@@ -0,0 +1,11 @@
+import 'package:model/model.dart';
+
+extension ListEmailContentExtension on List<EmailContent> {
+
+  String get asHtmlString {
+    if (isNotEmpty) {
+      return map((content) => content.asHtml).join('</br>');
+    }
+    return '';
+  }
+}