title: Issue starting ROS launch-File using RQT Plugin push button
body: <p>I implemented a RQT Plugin with several push buttons. The push button is supposed to start a ROS launch file. For some reason every time I start it I get the error message:  Shutdown request received.  Reason given for shutdown: [new node registered with same name]
  Even though the launch file has only been started once. The launch file also works fine when it's started without the plugin. </p>
  
  <p>This is my code sample for the implementation of the slot:</p>
  
  <p>`</p>
  
  <pre><code>void PluginStartButtons::buttonPressedKameraStart(bool checked)
  {
      QProcess* k_process = new QProcess;
      k_process-&gt;setProcessChannelMode(QProcess::MergedChannels);
      QString command = "roslaunch neo_watch_launch thermal_rgb_camera.launch";
      k_process-&gt;start(command);
      system(qPrintable(command));
  
  
  }
  </code></pre>
  
  <p>`</p>
  
  <p>Do you have any idea why this error might occur?</p>