SUMMARY
KIO::file_copy will not report 'Operation not permitted' as a result of chattr +i as not a KJob::NoError on job->error().

STEPS TO REPRODUCE
1. Make a file /home/user/test.txt
2. chattr +i /home/user/test.txt
3.  Run this code snippet:


QPointer<KIO::FileCopyJob> const moveJob = KIO::file_copy( QUrl::fromLocalFile( "/home/user/test.txt" ), QUrl::fromLocalFile( "/home/user/target.txt" ), -1, KIO::HideProgressInfo | KIO::Overwrite );

connect( moveJob.data(), &KJob::result, this, [ moveJob]( KJob* job )
	{
		bool failed = false;
		if ( !moveJob ) {
			qWarning() << "Failed A";
		} else {
			if ( moveJob->error() != KJob::NoError && job->error() != KJob::NoError )
			{
				qWarning() << "Failed B";
			} else {
				qWarning() << "Succeeded";
			}
		}
	} );
	
OBSERVED RESULT
* kf.kio.workers.file, Warning: Couldn't remove original dest "/home/user/test.txt" ( Operation not permitted )
* kf.kio.workers.file, Warning: Couldn't rename "/home/user/test.txt.part" to "/home/user/test.txt" ( Operation not permitted )
* Succeeded
* a unexpected new file called /home/user/test.txt.part in /home/user

EXPECTED RESULT
Failed B

SOFTWARE/OS VERSIONS
KIO: kio-5.105.0-619.67
Windows: n/a
macOS: n/a
Linux/KDE Plasma: n/a
KDE Plasma Version: n/a
KDE Frameworks Version: n/a
Qt Version: 5.8

ADDITIONAL INFORMATION