message: Don't update buffer viewer display if we just mousemove without clicking
diff: @@ -2543,8 +2543,12 @@ void BufferViewer::render_mouseMove(QMouseEvent *e)
  if(e->buttons() & Qt::RightButton)
  render_clicked(e);
  + // display if any mouse buttons are held while moving.
  + if(e->buttons() != Qt::NoButton)
  + {
  INVOKE_MEMFN(RT_UpdateAndDisplay);
  }
  +}
  void BufferViewer::render_clicked(QMouseEvent *e)
  {
  