Fix joh#30: Remove set of watched directories

pyinotify will ignore paths which already have a watch, so it's safe to
call add_watch() multiple times for the same path.

whenchanged/whenchanged.py

@@ -97,17 +97,15 @@ def run(self):
                 pyinotify.IN_MOVED_TO |
                 pyinotify.IN_CREATE)
 
-        watched = set()
         for p in self.paths:
-            if os.path.isdir(p) and not p in watched:
+            if os.path.isdir(p):
                 # Add directory
                 wdd = wm.add_watch(p, mask, rec=self.recursive,
                                    auto_add=self.recursive)
             else:
                 # Add parent directory
                 path = os.path.dirname(p)
-                if not path in watched:
-                    wdd = wm.add_watch(path, mask)
+                wdd = wm.add_watch(path, mask)
 
         notifier.loop()