transforms + Plotly.react bug

[alexcjohnson]

A user encountered a problem with Plotly.react and transforms, changing pie aggregation & labels simultaneously. The following examples start with A/B/C and switch to X/Y/Z on clicking the button.

Works fine using Plotly.restyle:
https://codepen.io/alexcjohnson/pen/geaRej?editors=0010

But not with Plotly.react:
https://codepen.io/alexcjohnson/pen/xWwrXR?editors=0010

However Plotly.react works fine using the same aggregation that's built into pies since #2117:
https://codepen.io/alexcjohnson/pen/BroZNx?editors=0010

reported by @Snazzypants in plotly/react-plotly.js#62

[etpinard]

Possibly related: https://community.plot.ly/t/plotly-js-cannot-read-property-length-of-undefined-when-clearing-filter-transforms/8890/4