Function mergeOption

libs/echarts/echarts-en.simple.js:22496–22522

* Consider case: * `chart.setOption(opt1);` * Then user do some interaction like dataZoom, dataView changing. * `chart.setOption(opt2);` * Then user press 'reset button' in toolbox. * * After doing that all of the interaction effects should be reset, the * chart should be the same as the resu

(oldOption, newOption)

 * 2. Use a shadow ecModel. (Performace expensive)
 */
function mergeOption(oldOption, newOption) {
    newOption = newOption || {};

    each$4(newOption, function (newCptOpt, mainType) {
        if (newCptOpt == null) {
            return;
        }

        var oldCptOpt = oldOption[mainType];

        if (!ComponentModel.hasClass(mainType)) {
            oldOption[mainType] = merge$1(oldCptOpt, newCptOpt, true);
        }
        else {
            newCptOpt = normalizeToArray(newCptOpt);
            oldCptOpt = normalizeToArray(oldCptOpt);

            var mapResult = mappingToExists(oldCptOpt, newCptOpt);

            oldOption[mainType] = map$1(mapResult, function (item) {
                return (item.option && item.exist)
                    ? merge$1(item.exist, item.option, true)
                    : (item.exist || item.option);
            });
        }
    });
}

/*
* Licensed to the Apache Software Foundation (ASF) under one