If you Cancel the password dialog when opening an header-encryted archive, the Part stays busy.
The bug was exposed by commit a537c5e.
It looks like the KJob::result signal (connected in Part::registerJob) is not received by the part.
Same thing if we abort a Corrupt query dialog.
My previous commit (02d26d42) triggers a crash if we close the main window while a job is running. We need to find another solution...
This has now evolved into a crash...
The crash is caused by m_model->setArchive(Q_NULLPTR); in Part::slotLoadingFinished().
The job currently has the KJob::KilledJobError set.
A possible solution is to use another error code to distinguish this job and not call setArchive if that is the case.