hideMask

hideMask fails because it directly attempts to acces maskTarget (instead of _maskTarget). It should call me.getMaskTarget()

Code:

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hideMask: function() {        var me = this;
        if (me.getMaskTarget()) {
            me.maskTarget.unmask();
            me.setMaskTarget(null);
        }
        return me;
}

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Thanks for the report.