Add counter on comment form

lib/ui/screens/conversation_screen.dart

@@ -325,15 +325,8 @@ class _ConversationScreenState extends State<ConversationScreen> {
               maxLengthEnforced: true,
 
               // Show max length only when there is some text already typed
-              buildCounter: (
-                BuildContext context, {
-                @required int currentLength,
-                @required int maxLength,
-                @required bool isFocused,
-              }) =>
-                  currentLength > 0
-                      ? Text("$currentLength/$maxLength")
-                      : Container(),
+              buildCounter: smartInputCounterWidgetBuilder,
+
               enabled: !_isSendingMessage,
               controller: _textEditingController,
               onChanged: _updatedText,