Tooltip is jiggling on arearange when followPointer is set to true

[Izothep]

Tooltip is jiggling on arearange after followPointer is set to true. Example of this behaviour:
http://jsfiddle.net/2a67qog8/4/

It looks to be connected with value of arearange, when min is bigger than 0 everything works fine, probably connected with standard behaviour for tooltip at arearange:
http://jsfiddle.net/2a67qog8/5/

Edit: Highcharts have the same problem as Highstock with this behaviour:
http://jsfiddle.net/2a67qog8/6/

As a workaround it is possible to use tooltip.positioner for placing tooltip.
example: http://jsfiddle.net/2a67qog8/8/

[TorsteinHonsi]

Internal note:

When the tooltip is shared, it is supposed to follow the mouse's y position.

[jon-a-nygaard]

It appears to be with the preferFarSide logic in Tooltip.getPosition()

preferFarSide = pick(point.ttBelow, (chart.inverted && !point.negative) || (!chart.inverted && point.negative))

The jiggling happens in this case when point.negative is true. Which seems to be the correct logic and behaviour. So not sure anymore if this is a "bug".

Also to note, I believe a potential simplification of this logic could be:

preferFarSide = pick(point.ttBelow, !chart.inverted === !!point.negative);

[pawelfus]

Since we have followPointer set to true, then shouldn't preferFarSide be used at all?

[jon-a-nygaard]

@pawelfus: I am thinking the same, when I set preferFarSide explicitly to false then it is behaving how I expected it.

[TorsteinHonsi]

This just in: The issue can also be seen on vanilla line charts, briefly when hovering over the negative point: http://jsfiddle.net/highcharts/zv5nc6xd/