scatterpolargl in 'lines' mode smears on axis rotation

[jonmmease]

For a scatterpolargl trace in lines mode, when the axes are rotated by clicking and dragging on an axis label, the lines smear across the plot. The smearing is removed on release:

CodePen: https://codepen.io/anon/pen/MBzLKp

Rotation example:

FWIW, this doesn't occur in markers mode.

[alexcjohnson]

But it's so pretty :)

Confirmed - in fact, doesn't seem to happen in lines+markers mode, only in lines with or without fill

[etpinard]

Thanks for the report @jonmmease !