FormPanel SubmitCompleteEvent not triggered

Hi,

We have a problem, it looks like the SubmitCompleteEvent is not triggered when the response is http status code 400 on FireFox and Safari (could be all error codes), but it is working on Chrome.

We have two different upload file forms on our site, one is receiving json response, the other is receiving text/html response, both behave the same way.

GWT version is 2.8.2, Mac OS version is 10.13.3

Chrome (version 65.0.3325.181)

Response http status code 200 SubmitCompleteEvent is triggered, Response 400 http status code SubmitCompleteEvent is triggered

Firefox (version 59.0.2)

Response http status code 200 SubmitCompleteEvent is triggered, Response 400 http status code SubmitCompleteEvent is not triggered

Safari (version 11.0.3)

Response http status code 200 SubmitCompleteEvent is triggered, Response 400 http status code SubmitCompleteEvent is not triggered (response is downloaded :) )

Strange thing is that one of the forms is relatively old functionality and it was working correctly before, we just noticed that it stopped working, but it could be that it didn't work correctly in some time.

Is this a known bug? Is there a workaround?

Regards

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