subplots webgl bug

[jackparmer]

Tried to make a 5 X 7 scattergl subplot and some of the subplot panels are hidden:

https://plot.ly/~jackp/17617/#plot

The SVG version works and the "missing data" sometimes flickers on hover in the GL version. Also if you toggle the legend items you can get the missing panels to redraw and show up:

Apologies if this is already a know issue, I couldn't find it anywhere.

Maybe large scattergl subplot trellises should be one of the image tests.

@alishobeiri has a nice Dash app where you can play with different GL subplot layouts:

https://dash-diamonds-explorer.herokuapp.com/

[etpinard]

probably a duplicate of #1680

[jackparmer]

Ahhhh... Looks like it's related to this:

If so, probably won't be a fix until the great regl migration:
#949 😑

[etpinard]

Looking sharp with @dfcreative 's regl-based scattergl

[dy]

72cc1a3 adds test mock:

(pretty impressed how performant it is)

[etpinard]

(pretty impressed how performant it is)

Yep me too. Solid performance cc @jackparmer

[etpinard]

I'm really happy about this one.

Done in -> #2258