fen: allow watching subdirectories of watched directories #621
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When watching /tmp, w.port.PathIsWatched(name) returned true for /tmp/abc. PathIsWatched() checks:
That e.paths gets set in EventPort.AssociatePath(), which is called by Watcher.associateFile() for every path inside a watched directory. So it can never watch subpaths.
Anyway, this seems safe to remove. Could check our own Watcher.dirs state, but this doesn't seem needed (we already have tests for watching the same path more than once).
(This came rolling out of #620).