IFileProvider Deleting file does not fire Watch IChangeToken

[HaoK]

Expectation is that delete will fire the IChangeToken returned from Watch

        [Fact]
        public void DeletingFileWillFire()
        {
            var fileProvider = new PhysicalFileProvider(_basePath);

            var token = fileProvider.Watch("test.txt");
            Assert.False(token.HasChanged);
            File.WriteAllText(Path.Combine(_basePath, "test.txt"), @"{""JsonKey1"": ""JsonValue1""}");
            Assert.True(token.HasChanged);

            var token2 = fileProvider.Watch("test.txt");
            Assert.False(token2.HasChanged);
            File.Delete(Path.Combine(_basePath, "test.txt"));
            Thread.Sleep(1000);
            Assert.True(token2.HasChanged, "Deleted");
        }

[HaoK]

Maybe related to #34?

[HaoK]

Discovered by aspnet/Configuration#433

[divega]

@muratg @Eilon can this be triaged for RTM?

[Eilon]

Yeah this looks pretty broken.

[muratg]

@victorhurdugaci Please investigate. If the root cause is in CoreFX, let's file a bug there.

[victorhurdugaci]

The token triggers on delete. It's not a file system issue. See the comments in aspnet/Configuration#433 for the root cause