deselect method
对target
进行取消选择操作
Implementation
List<T>? deselect(T target) {
if (_subject.isClosed) {
L.w('IO在close状态下请求发送数据');
return null;
}
assert(latest is List<Selectable>);
return forEach((T data) {
if (data is Selectable) {
if (data == target) data.isSelected = false;
}
});
}