Avoid mixing up terminal.write command with user input

Dockerfile

@@ -1,5 +1,9 @@
-FROM avatao/frontend-tutorial-framework:chausie-20191021 as frontend
+ARG FRONTEND_VERSION
+FROM avatao/frontend-tutorial-framework:${FRONTEND_VERSION} as frontend
+
 FROM avatao/debian:buster
+ARG FRONTEND_VERSION
+LABEL tfw.frontend.version=${FRONTEND_VERSION}
 
 RUN apt-get update                           &&\
     apt-get install -y --no-install-recommends \

tfw/components/frontend/frontend_config_handler/frontend_config_handler.py

@@ -12,7 +12,7 @@ class FrontendConfigHandler:
     def handle_event(self, _, connector):
         # pylint: disable=no-self-use
         for message in self._config_messages:
-            connector.send_message(message)
+            connector.send_message(message, scope=Scope.WEBSOCKET)
         connector.send_message({'key': 'frontend.ready'}, scope=Scope.WEBSOCKET)
 
     @property

tfw/components/terminal/terminal_handler.py

@@ -42,6 +42,9 @@ class TerminalHandler:
             LOG.error('IGNORING MESSAGE: Invalid message received: %s', message)
 
     def handle_write(self, message):
+        concat = message.get('concat', False)
+        if not concat:
+            self.terminado_server.pty.write('\x15')
         self.terminado_server.pty.write(message['command'])
 
     def cleanup(self):