WebDAVFileProvider#writeContents not reconnecting with credentials after 401

[tladesignz]

I tried the latest master (9384264) to get rid of the Swift version warnings.

Unfortunately, a regression was introduced: As far as I can understand from my Nextcloud server logs, WebDAVProvider#writeContents doesn't reconnect on HTTP 401 (Unauthorized) with credentials anymore.

This works with last release 0.25.1.

[tladesignz]

Ok. Today's Xcode update with Swift 5 forced me to use the latest fork I could find.

I tried to work around this by writing a temp file and using #copyItem(localFile:to:completionHandler:). This still breaks. So it must be the content, which is JSON.
Somehow this breaks the upload. Sometimes without any error message (just hanging) or with -999:

Task <7F91F278-D7B1-4C00-9A88-22D6BAEF018D>.<1> load failed with error Error Domain=NSURLErrorDomain Code=-999 "cancelled" UserInfo={NSErrorFailingURLStringKey=https://nextcloud.example.com/remote.php/webdav/Test/2019-03-26T15%3A13%3A43GMT+01%3A00/IMG_0005.JPG.meta.json, NSErrorFailingURLKey=https://nextcloud.example.com/remote.php/webdav/Test/2019-03-26T15%3A13%3A43GMT+01%3A00/IMG_0005.JPG.meta.json, _NSURLErrorRelatedURLSessionTaskErrorKey=(
    "LocalUploadTask <7F91F278-D7B1-4C00-9A88-22D6BAEF018D>.<1>"
), _NSURLErrorFailingURLSessionTaskErrorKey=LocalUploadTask <7F91F278-D7B1-4C00-9A88-22D6BAEF018D>.<1>, NSLocalizedDescription=cancelled} [-999]
2019-03-26 15:14:19.525753+0100 OpenArchive[9762:148233] Task <7F91F278-D7B1-4C00-9A88-22D6BAEF018D>.<1> finished with error - code: -999
2019-03-26 15:14:19.526516+0100 OpenArchive[9762:148232] Task <7F91F278-D7B1-4C00-9A88-22D6BAEF018D>.<1> HTTP load failed (error code: -999 [1:89])

The next upload, which is an image file, works without problems. As mentioned, the last release works just fine with the JSON content.

What did change?