dvLocationToPlatform function
The address the browser shows for an internal location: under the
mount, the path without it. Unchanged otherwise.
Implementation
String dvLocationToPlatform(String location) {
final String? mount = _mount;
if (mount == null) return location;
final (String path, String rest) = _split(location);
if (!_under(path, mount)) return location;
return '${_current!.hostPath(path)}$rest';
}