Fix watching non-recursive files in a symlinked directory (821)

[NiklasRosenstein]

See #821

It appears that in fsevents, the events will contain the "real" file paths. This will break if fsevents end up generating events with the not-"real" path instead, for which I don't know if it could happen or not. The way around this would be to also use os.path.realpath() for the src_path in _is_recursive_event().

[NiklasRosenstein]

@gorakhargosh I can't reproduce the test_watcher_deletion_while_receiving_events_2 test failing on my machine in Python 3.7. I've looked a bit at the test case and it seems it is looking to produce a failure that occurs randomly. Sounds to me like there could be a chance that this test just failed out of pure chance and not because the PR breaks something.

I don't have permission to re-run the tests. Could you kick it off once more? (Or provide some input on what may be going on here?)

[BoboTiG]

It seems good for me. How do you feel it @CCP-Aporia?

[CCP-Aporia]

The change itself looks good to me. Thanks for fixing this @NiklasRosenstein !

The test failure should be unrelated to this change as well, though I am surprised to see that one being back. I thought we fixed all those issues around the watcher being None previously. 🤔

[BoboTiG]

Thanks for the confirmation @CCP-Aporia and thanks @NiklasRosenstein for the fix 👍

About the failure, it is quite random, let's not focus on it right now :)