Hovertemplate display of X value of points in hoverset that differ from that of the winning point

Right now, in compare and unified hover modes, it’s possible for points to be in the hover set and still have slightly different X values from that of the point that won the hover, and in this case we show the differing X value in parentheses in the hoverlabel.

We need to be able to show this value when hovertemplate is active as well, possibly via some new hovertemplate %{value} that is empty if the X value matches that of the winning point, and contains “(%{x})” otherwise.

This should honor the new (x|y)hoverformat attributes too.

[nicolaskruchten]

Basically the use case is this: https://codepen.io/nicolaskruchten/pen/MWpEQqZ?editors=0010 … on line 15 we want to be able to add %{xother} or something so that the Q1 will appear in the unified hoverlabel.

[nicolaskruchten]

The use case is when you have, say, quarterly bars and monthly scatters AND you’re using hovertemplate and unified hover. Right now when you hover on a scatter point, you don’t get the indication about the X-coordinate of the bar. If you don’t use hovertemplate you do, so we need to add this capability to hovertemplate.

I think that using (x, y) is quite conventional and I don’t think we should change it in v2.