spikedistance=-1: lines are not drawn up to the closest bar in some cases

[antoinerg]

Following the introduction of #4637, the following edge case will need to be fixed:

See #4627 (comment) for a complete description of the issue and a suggestion on how to fix it.

[gvwilson]

Hi - we are currently trying to tidy up Plotly's public repositories to help us focus our efforts on things that will help users most. Since this issue has been sitting for several years, 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 backlog. Thanks for your help - @gvwilson