The windows filesystemwatcher did not watch for attribute changes for
directories (e.g. hidden flag) so it was not in sync with other
backends. Fix it by adding FILE_NOTIFY_CHANGE_ATTRIBUTES to the watch
flags when watching a directory.
[ChangeLog][QtCore][QFileSystemWatcher] Fixed a bug that caused QFSW not
to watch for attribute changes on Windows. Now it will correctly report
when files and directories become hidden or unhidden, for example.
Fixes: QTBUG-80545
Change-Id: I31767a0da899963e3940b4f5b36d1d581e6aa57c
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
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