Need I prepare an Electron sample?

Yes, that would nice. Using a https://gist.github.com/ would be best.

At the very least, could you describe what's broken about it? What do you see? Any console errors? etc?

The data in the codepen is different from what you've got in your screenshot. You can use Plotly.Plots.graphJson(graphDiv) to pull out the exact plot and put that into codepen, see if that shows what you want it to.

I'm assuming what you mean by "broken" is that there are gaps in the line - which implies that some of the data was interpreted as non-numeric. Does the same thing happen if you switch to regular scatter, not scattergl?

@alexcjohnson yes, I mean there are gaps in the line. And it works as regular scatter, only has problem with scattergl.

I made a work around to fix it.

  for (let i = 0, l = data.length; i < l; i++) {
    const d = data[i];
    if (d.mode === 'lines') {
      d.mode = 'lines+markers';
      d.marker = {
        color: d.line.color,
        size: d.line.width,
        symbol: 'circle'
      };
    }
  }
  Plotly.newPlot(Setting.GRAPH_DIV, data, layout);

@etpinard I uploaded a project in [email protected]:wangyueming/plotly_bug_repeat.git.
Git clone it and run npm install & npm start, you will see the result.

I got it repeated in codepen.
https://codepen.io/yueming0799/pen/mXLwYx?editors=0010

Thanks very much @wangyueming

This is a side-effect from the scattergl regl push. Versions previous to 1.33.0 appear to be working fine.

See https://codepen.io/etpinard/pen/oEaaVq?editors=1010 for a comparison.

cc @dfcreative (this is still a problem on master)

Fixed in #2564