Highstock Navigator Mask doesn't cover content

Question

I'm trying to style the mask covering the un-selected region in the Navigator. I have:

navigator.maskFill: 'rgba(233, 233, 233, 0.7)'

which generates a nice grey overlay indicating the content is not currently being displayed in the chart.

Unfortunately for some reason this mask doesn't completely cover the data, as seen here highlighted in red:

The mask appears 1px too short. Can anybody explain why, or suggest how to fix/work around this?

Edit jsfiddle showing example: http://jsfiddle.net/s6BmC/2/

Answer 1

Indeed it looks like a bug, reported here: https://github.com/highslide-software/highcharts.com/issues/2710