Multiple axes with scattergl traces causes left axes labels to be cut off

[halfs13]

Visible in this JSfiddle. This may be caused by the same problem that is causing #127.

This also happens with a single x axis and multiple y axes if y is marked side: 'left' and y2 is side: 'right'

[etpinard]

Overlaid axes are not supported in gl2d graphs at the moment.

@halfs13 Thanks for bringing this up. I forgot to port over the known gl2d limitations from plotly's closed-source repo to this repo.

The complete list of known gl2d limitations is in: #130

[etpinard]

@halfs13

Moreover, in all fairness, I do not recommend making gl2d graphs with multiple axes at the moment.

The current framework creates one canvas and one gl-context per pair of axes, which can be very slow to initialize.

In its current form, gl2d works great for big data on a single x-y plane. For other layouts, I'd would stick to svg2d.

In the future, we would like to create only one canvas and only one gl-context for all axes.

[etpinard]

Will be fixed by @dfcreative 's regl-based scattergl work:

[dy]

Test mock d646e2c

[etpinard]

done in #2258 (finally)