Add 'connectends' attribute to scatterpolar lines

[nicolaskruchten]

Much as I don't love "spider charts" people do like making them, and with our current scatterpolar implementation, people need to duplicate the first data point in order to close the line. Could we add a per-trace flag for that?

[etpinard]

listed here -> #2255 (comment)

[etpinard]

Would this soon-to-be scatterpolar attribute make sense for other scatter* trace types? I can imagine it be useful for fill: 'toself' (cartesian) scatter traces - would that be too much an API overkill?

[nicolaskruchten]

Sure why not :)

[alexcjohnson]

Would be a cool effect on scattergeo wrapping around the earth too.

[gvwilson]

Hi - this issue has been sitting for a while, so as part of our effort to tidy up our public repositories I'm going to close it. If it's still a concern, we'd be grateful if you could open a new issue (with a short reproducible example if appropriate) so that we can add it to our stack. Cheers - @gvwilson