Prototype.js breaks svg-painter

If someone enqueues prototype.js ( happens for the old built-in colorpicker for example ), prototype.js extends the prototype of the native array object (surprise).

In that case this.elements on line 45 (svg-painter.js) is not an empty array and svg-painter will throw an error on line 47 where
$element equals the “each”-method which was added by prototype.js.

I’m not sure why this happens but something like:
if ( this.elements.length > 0) { for var key ....{} }
should be added for such edge cases maybe.

regards

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