computeRootsFromFiles method
Computes roots from a set of files.
The file paths does not neccessarily be normalized.
Implementation
void computeRootsFromFiles(Iterable<String> filePaths) {
final roots = filePaths
// .map((folderPath) =>
// path.dirname(HTResourceContext.getAbsolutePath(key: folderPath)))
.toSet();
setRoots(roots);
}