code: public void forceInform(final EventDispatcher pDispatcher) {
          dirs.values().forEach(d -> d.forceInform(pDispatcher));
      }
docs: <p>Iterates through all registered directories and passes all their files to the
  {@link ch.sourcepond.io.fileobserver.api.PathChangeListener#modified(PathChangeEvent)} of the observer specified.
  This is necessary for newly registered observers who need to know about all watched files. See
  {@link #registerRootDirectory(EventDispatcher, WatchedDirectory)} and to get an idea how directories are
  registered with this object.
  
  <p>Note: it's guaranteed that the {@link Path} instances passed
  to the observer are regular files (not directories).