handle.className.indexOf is undefined if handle is svg element

[makeover]

Im using Highcharts (i.e. SVGs) inside my grids and clicking on them throws an error:
Uncaught TypeError: handle.className.indexOf is not a function

Wrapping the SVG inside a div doesnt seem to help.

However, adding a check for SVGs probably would:
!(handle instanceof SVGElement)

[hjalmers]

Thanks for the feedback, it will be part of next release (after alpha.0)

[makeover]

Thanks, but you need to change from:
handle.className.indexOf('bg-handle') !== -1 && !(handle instanceof SVGElement);
to:
!(handle instanceof SVGElement) && handle.className.indexOf('bg-handle') !== -1;
since otherwise the faulty check would still run.

[hjalmers]

You're absolutely right @makeover, just wanted to make sure you were paying attention hehe:P No, seriously thanks for the heads up:)