moveIn method
Moves the folder staged as id to path, which must not exist.
Implementation
void moveIn(String id, String path) {
_checkOpen();
final staged = _own(staging, id);
if (FileSystemEntity.typeSync(staged.path, followLinks: false) !=
FileSystemEntityType.directory) {
throw StateError('Nothing is staged as $id.');
}
_inside(path);
final target = project.dir(path);
target.parent.createSync(recursive: true);
if (target.existsSync()) {
throw StateError('$path already exists.');
}
_movedIn.add(path);
_save();
retryOnLock(() => staged.renameSync(target.path));
}