message: Clear timeline bar current state when closing capture
diff: @@ -111,6 +111,11 @@ void TimelineBar::OnCaptureClosed()
  {
  setWindowTitle(tr("Timeline"));
  + m_ID = ResourceId();
  + m_HistoryTarget = m_UsageTarget = QString();
  + m_HistoryEvents.clear();
  + m_UsageEvents.clear();
  +
  m_Draws.clear();
  m_RootDraws.clear();
  m_RootMarkers.clear();
  