解决cesium因为transfrom缩放引起的偏移问题

cesium中给地图容器设置了transfrom之后，地图会发生偏移

解决方案：需要修改cesium源码，以cesium1.91为例，修改 Cesium-1.91\Source\Core\ScreenSpaceEventHandler 文件中关于 getPosition 部分

function getPosition(screenSpaceEventHandler, event, result) {
    var element = screenSpaceEventHandler._element;
    var fa = element.offsetWidth / element.getBoundingClientRect().width;
    var fa1 = element.offsetHeight / element.getBoundingClientRect().height;
    if (element === document) {
        result.x = event.clientX * fa;
        result.y = event.clientY * fa1;
        return result;
    }

    var rect = element.getBoundingClientRect();
    result.x = (event.clientX - rect.left) * fa;
    result.y = (event.clientY - rect.top) * fa1;
    return result;
}