inotify: proper fix for issue1542 (partially reverting 67e59a9886d5)

issue1542 description:
Unknown files (?) placed in a directory are still marked as present and unknown
when the containing directory is moved out of the repository scope.

Why 67e59a9886d5 was bad:
* When the problem we're addressing only deals with unknown files, the fix to
  updatestatus applies for all statuses
* The only reason to move the call schedule_work(wpath, 'd') seems to be that
  it allowed an updatestatus call on the deleted directory, in deleted(). But
  deleted() should not be called on directories in the first place.
* After fixing an independant issue (1371), test-inotify-issue1542 was failing

Fix:
When processing a deletion of a directory, walk the tree of the unknown files
and remove the entries from repowatcher.
This step does not need to be added in the generic scan() routine: it is only
necessary on a directory deletion.

hgext/inotify/server.py

@@ -311,10 +311,6 b' class repowatcher(object):'
                         dd[fn] = newstatus
             else:
                 d.pop(fn, None)
-        elif not newstatus:
-            # a directory is being removed, check its contents
-            for subfile, b in oldstatus.copy().iteritems():
-                self._updatestatus(wfn + '/' + subfile, None)
 
 
     def check_deleted(self, key):
@@ -483,7 +479,11 b' class repowatcher(object):'
                          (self.event_time(), wpath))
 
         if evt.mask & inotify.IN_ISDIR:
+            tree = self.dir(self.tree, wpath).copy()
+            for wfn, ignore in self.walk('?', tree):
+                self.deletefile(join(wpath, wfn), '?')
             self.scan(wpath)
+        else:
         self.schedule_work(wpath, 'd')
 
     def process_modify(self, wpath, evt):