docs: public final void lazyRefresh() {
      if(plot == null) {
        LOG.warning("'lazyRefresh' called before initialized!");
        return;
      }
      LOG.debug("Scheduling refresh.");
      Runnable pr = new Runnable() {
        @Override
        public void run() {
          if(OverviewPlot.this.pendingRefresh.compareAndSet(this, null)) {
            OverviewPlot.this.refresh();
          }
        }
      };
      OverviewPlot.this.pendingRefresh.set(pr);
      plot.scheduleUpdate(pr);
    }