FileManagerDocumentModelFactory should use proper document type

Note: Not sure if it's a bug or a feature request. But since the importer implements the FileManagerDocumentModelFactory class, one expects it to be usable

So the problem is: I need to import files and have Nuxeo create the correct document types. The default importer creates a "File" for every file imported. The FileManagerDocumentModelFactory is supposed to create the correct type: A "Picture" for a .jpg, a "Video" for a .mov, etc.

The problem is in the DefaultImporterServiceImpl class (nuxeo-importer-core). Basically, this service is ready to handle only {{DefaultDocumentModelFactory{{, not anything else:

// . . .
protected DefaultDocumentModelFactory getDocumentModelFactory() {
  // . . .
  && (DefaultDocumentModelFactory.class.isAssignableFrom(docModelFactoryClass))
}
// . . .

=> The FileManagerDocumentModelFactory extends AbstractDocumentModelFactory, not DefaultDocumentModelFactory, so isAssignableFrom is always false, and the importer falls back to DefaultDocumentModelFactory.