When I have many (many) series on a stockChart, I've long wished to be able to use the mouse to hover near a point and let the tooltip tell me which series it belongs too -- due to limited colors available, it becomes impossible to tell by color. Recently I was pointed to a new feature (since 5.0.10) findNearestPointBy on stackoverflow, which seems to do exactly what I want except it doesn't appear to work in a stockChart (as opposed to a regular chart - even with ordinal set to false).

I've put up two examples to show the different behaviors: stockChart vs. chart, the issues are:

1. findNearestPointBy does not seem to make a difference. If you place mouse directly above either of the two points next to the "bump" but at the height of the bump, the tooltip snaps to the bump on chart but to the lower points on stockChart.

2. when hovering near the points from both series at the same x-value, stochChart tooltip shows both series whereas chart tooltip only shows the series whose nearest point is closer - I much prefer the latter as I want the tooltip to tell me which series the nearest point belongs to.