Parcoords line color restyle problems

[etpinard]

See https://codepen.io/etpinard/pen/YJVrKm

[archmoj]

Version 1.35.2 released on March 9, 2018 looks like the last old version of plotly in which one of the restyle or relayout functions works:
One could refer to this code pen demo, and also test the functionality with version 1.36.0 or higher.

[archmoj]

@etpinard Just noticed that the codepen I'd created above was showing the latest version in which the restyle call use to work properly on parcoords (of course before it was fixed again in v1.42.0 ).
So this other demo actually displays the performance at version 1.41.3 with a white context layer at the start.
If required I may add another test to lock this as well?

[etpinard]

Now I see. That first rendered view is missing a grey line. Good eye!

If required I may add another test to lock this as well?

That would be great! No need to do this now, opening a new issue about it would suffice.