The source project of this merge request has been removed.
Disable button for changing scanner while scan is in progress to prevent sane from crashing
When clicking "Reselect scanner device" during a scan, there was a segfault whose backtrace lead to ksanecore's ScanThread::readData().
I felt that instead of trying to properly handle this situation and deal with the involved threads, it'd be easier to disable the button during the scan.