Scatter trace hover appears at incorrect x value

[csyrs]

Example: http://codepen.io/anon/pen/WGvjGX?editors=1111

Mouse over the graph and observe that the hover position does not correspond to the x value logged in the console (and not just as a result of rounding). The console value is from the plotly_hover event and seems to more faithfully represent the actual mouse position.

In contrast, switching to a bar trace seems to align the hovers with the plotly_hover values.

[etpinard]

most likely related to #803 and #780

[fhurta]

Although haven't found that documented, my understanding was that data.xvals refer to cursor position while data.points to the corresponding trace's points. See the updated pen

[alexcjohnson]

(cleaning up old bugs)

@fhurta is correct here - data.xvals is the cursor position (on whatever x axes exist on this subplot) whereas data.points shows the point(s) we found in data traces to hover on. I don't think there's a bug here.