hovertemplate displays unwanted trace information

[mbejda]

Here is a codesandbox demonstrating this issue.
https://codesandbox.io/s/8xqw51zr18
If hovertemplate is set to %{y:,.2f}" the chart display unwanted trace information on hover.

To get around that bug I need to append additional information to the hovertemplate.
"%{y:,.2f}<extra></extra>" so that the hover renders correctly.

[antoinerg]

Thank you @mbejda for pointing this out. Appending an empty extra tag as you did is exactly how to get rid of the default hover secondary box. I will update the documentation of the hovertemplate to mention this as it may not be obvious at all.

[antoinerg]

@mbejda if you don't mind, I will keep this issue open until we merge PR #3623! The documentation should be updated.

Thanks again for reporting this!