inotify somehow missing modification events for dropbox file

[daveola]

I'm trying to use rb-inotify to watch a file that gets appended to by dropbox (sync to local computer).

I have even tried watching for any events:

queue.watch(filename, :all_events) { puts "EVENT!" }

But I see nothing if dropbox modifies the file (though I do see this message if I append to the file directly).

How is the dropbox app getting around inotify in it's file modifications??