SUMMARY If Kompare is used to compare a non-existent local file with another file: Kompare says "The URL [...] does not exist on your system", but if the non-existent file is remote, then Kompare silently fails. STEPS TO REPRODUCE 1. Execute: kompare sftp://127.0.0.1/non-existent.txt /etc/hosts OBSERVED RESULT Kompare does nothing. EXPECTED RESULT Kompare should inform that it can not access sftp://127.0.0.1/non-existent.txt SOFTWARE/OS VERSIONS KDE Plasma Version: 5.18.5 KDE Frameworks Version: 5.68.0 Qt Version: 5.12.8