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(function($) {
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    var Defaults = $.fn.select2.amd.require('select2/defaults');
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    $.extend(Defaults.defaults, {
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        searchInputPlaceholder: '',
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        searchInputCssClass: '',
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    });
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    var SearchDropdown = $.fn.select2.amd.require('select2/dropdown/search');
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    var _renderSearchDropdown = SearchDropdown.prototype.render;
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    SearchDropdown.prototype.render = function(decorated) {
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        // invoke parent method
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        var $rendered = _renderSearchDropdown.apply(this, Array.prototype.slice.apply(arguments));
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        this.$search.attr('placeholder', this.options.get('searchInputPlaceholder'));
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        this.$search.addClass(this.options.get('searchInputCssClass'));
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        return $rendered;
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    };
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})(window.jQuery);