selection on scattergl after relayout

[chriddyp]

I'm testing @jmmease's plotly.py 3.0.0 plotly/plotly.py#942 and seeing an issue with selection on scattergl with 1M points. This doesn't happen on the default graph, it only appears after I have modified the graph's width, height, and margin using Plotly.relayout.

This is a pretty uncommon workflow (calling relayout after plot draw) so it's not a high priority issue at all for plotly.py.

[etpinard]

Reproduced in https://codepen.io/etpinard/pen/KevRdr?editors=1010

Thanks for the report.

@dy anything comes to mind here?