Losing selection in multiple with custom query

[piernik]

If using multiple with custom query it's llosing selection.
in getSelection You call custom query function to fetch options. But often those option are defferent because of ajax. and earlier selected options are gone.
That's why You have to store previous selection
Change:

function getSelection(callback) {
    if (isMultiple) {
        getOptions(function (options) {
            var selection = [];
            for (var i = 0; i < options.length; i++) {
                var option = options[i];
                var viewValue = controller.$viewValue || [];
                if (viewValue.indexOf(option.id) > -1) {
                    selection.push(option);
                }
            }
            callback(selection);
        });
    } else {
        getOptions(function () {
            callback(optionItems[controller.$viewValue] || {obj: {}});
        });
    }
}

To:

var previousSelection = [];

function getSelection(callback) {
    if (isMultiple) {
        getOptions(function (options) {
            var selection = [];
            options = options.concat(previousSelection || []);
            for (var i = 0; i < options.length; i++) {
                var option = options[i];
                var viewValue = controller.$viewValue || [];
                if (viewValue.indexOf(option.id) > -1) {
                    selection.push(option);
                }
            }
            previousSelection = angular.copy(selection);
            callback(selection);
        });
    } else {
        getOptions(function () {
            callback(optionItems[controller.$viewValue] || {obj: {}});
        });
    }
}