message: Disable event browser toolbar buttons while no log is open
diff: @@ -115,6 +115,8 @@ EventBrowser::EventBrowser(ICaptureContext &ctx, QWidget *parent)
  QShortcut *sc = new QShortcut(QKeySequence(Qt::Key_Right | Qt::ControlModifier), this);
  QObject::connect(sc, &QShortcut::activated, this, &EventBrowser::on_stepNext_clicked);
  }
  +
  + OnLogfileClosed();
  }
  EventBrowser::~EventBrowser()
  @@ -148,6 +150,14 @@ void EventBrowser::OnLogfileLoaded()
  ui->events->expandItem(frame);
  + ui->find->setEnabled(true);
  + ui->gotoEID->setEnabled(true);
  + ui->timeDraws->setEnabled(true);
  + ui->bookmark->setEnabled(true);
  + ui->exportDraws->setEnabled(true);
  + ui->stepPrev->setEnabled(true);
  + ui->stepNext->setEnabled(true);
  +
  m_Ctx.SetEventID({this}, lastEID, lastEID);
  }
  @@ -156,6 +166,14 @@ void EventBrowser::OnLogfileClosed()
  clearBookmarks();
  ui->events->clear();
  +
  + ui->find->setEnabled(false);
  + ui->gotoEID->setEnabled(false);
  + ui->timeDraws->setEnabled(false);
  + ui->bookmark->setEnabled(false);
  + ui->exportDraws->setEnabled(false);
  + ui->stepPrev->setEnabled(false);
  + ui->stepNext->setEnabled(false);
  }
  void EventBrowser::OnEventChanged(uint32_t eventID)
  