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Box Plot: Whiskers/Median appear on hover if their width is set to 0 #7607
For box plot charts, whiskers and median should not appear on hover when their widths are already set to 0.
In the below fiddle, hover on any box plot. Whiskers and Median appear.
Live demo with steps to reproduce
The explanation can be found here:
The box plot series correctly sets with stroke with to zero, but the SVGRenderer translates it to nothing in order to work around a WebKit bug. On hover, the stroke is set on the parent group, and then inherited by the whisker.
An alternative workaround is to set the line width to something marginally greater than 0: http://jsfiddle.net/highcharts/h09psvn0/3/