Purging and removing element while hovering causes "undefined is not an object"

So, I'm unsure if this issue is with the react library or this one. But the responsible code resides in this repository so I'll try my luck here.

If you unmount a plot rendered in react while hovering your mouse over it, maindrag.onmouseout gets triggered before all event handlers are completely unregistered.

This causes the error undefined is not an object (evaluating 'gd._fullLayout._hoversubplot = null') at plotly.js:148662==graph_interact.js:79. I looked into it with a breakpoint and the issue seems to be that _fullLayout doesn't exist anymore on gd.

A simple fix (assuming this is an issue with plotly.js and not react-plotly.js) could be to just add || !dg._fullLayout to graph_interact.js:74. If it isn't an issue with plotly itself, it may still be a good idea to wrap the event handlers with try/catch and log a warning about not unmounting correctly instead of a flat out error.

Commencez dans src/plots/cartesian/graph_interact.js, autour des lignes 74-79, et reproduisez l’échec en démontant un graphique rendu par React pendant le survol. Vérifiez que le nettoyage du survol ne lève plus d’erreur lorsque gd._fullLayout est absent, tout en préservant le comportement normal de mouseout.