Closes#3437

This PR adds ahovertemplate attribute forohlc andcandlestick, allowing users to define a custom hover template for those traces.

hovertemplate:'opened at %{open}<br>closed at %{close}<extra></extra>',

Notes

• The first commit of this PR runs the biome formatter which introduces some noise into the diff. Usethis link to see only the meaningful changes.

• This PR also adds thehovertemplatefallback attribute for the two traces in question

• hovertemplate is ignored whenhoverlabel.split is set totrue. (Open to suggestions here but I couldn't see an obvious way to makesplit: true work with thehovertemplate API.)

• Two Jasmine tests added

This completes the list in#3437.

Thanks to@chriddyp for putting this on my radar!

To test

• Create a plot like this one:

Plotly.newPlot("plot",[{x:[1,2,3,4,5],low:[21,13,18,16,22],high:[34,23,25,26,24],open:[24,16,22,23,22],close:[22,18,21,21,23],type:'candlestick',// or 'ohlc'hovertemplate:'opened at %{open}<br>closed at %{close}<extra></extra>',// hoverlabel: {split: true},// if the above line is uncommented, `hovertemplate` should be ignored// and separate hover tooltips should be shown for open, high, low, and close}],);

• Hover over the data and confirm that the hovertemplate is respected
• Confirm that ifhoverlabel.split is set totrue, the hovertemplate is ignored and the previous behavior is unchanged