Plot bands rendered on top of all series

[v-kabanov]

Expected behaviour

Plot bands by default used to remain under data series, especially if their zIndex was lower.

Actual behaviour

Bands are plotted over data series regardless of zIndex.

Live demo with steps to reproduce

https://jsfiddle.net/6zc79tcr/8/
Click the "Update bands" button repeatedly. See also https://stackoverflow.com/questions/50502086/highcharts-plot-bands-rendered-on-top-of-all-series .

Product version

Highstock 6.1.0

Affected browser(s)

Chrome v66, Firefox v60

[KacperMadej]

Hi @v-kabanov

Thank you for reporting about the problem.

Here's a simpler demo: https://jsfiddle.net/BlackLabel/6zc79tcr/9/
After update (on a button click) axis elements are in front - also grid lines.

It happens when accessibility and exporting modules are loaded.

Internal note: addPlotBand and removePlotBand seems to be affected too.
Problematic: http://jsfiddle.net/BlackLabel/mudqbp3m/
Standard (working): http://jsfiddle.net/gh/get/library/pure/highcharts/highcharts/tree/master/samples/highcharts/members/axis-addplotband/

[TorsteinHonsi]

The issue only happens when the export SVG items are added to the chart.exportSVGElements array. If we comment out the following line, it works as expected:

highcharts/js/modules/exporting.src.js

Line 1503 in e8b9242

chart.exportSVGElements.push(button, symbol);

The exportSVGElements array is later only used in the accessibility module, so the issue must lie there @oysteinmoseng .