stock tools -- annotation miss its position when print and export as image

[wy1713]

Expected behaviour

With stock tools user can make an text, circle, square annotation on the highstock chart. The annotation position should be exactly the same place when it is drawn on the chart when using the exporting module to print the chart, export the chart to different types.

Actual behaviour

however when exporting the chart, or print, the annotation missed it's original position of the chart and locationed somewhere else

Live demo with steps to reproduce

https://jsfiddle.net/wzLfrhgs/
see attachment, I draw an small square on the highest value. but when I export as an png, it is miss aligned.

Product version

lastest

Affected browser(s)

chrome

[TorsteinHonsi]

@sebastianbochan

[TorsteinHonsi]

@pawelfus The test fails in Firefox, can you fix? Precision issues. I'll preliminary skip it so we can continue experimenting with CI.