SUMMARY Lock screen doesn't clear the entered password, when left idle without pressing "enter" key to login. STEPS TO REPRODUCE 1. lock the screen 2. enter password 3. leave the computer idle for few minutes OBSERVED RESULT The entered password is still present. EXPECTED RESULT The entered password is cleared, after leaving the computer idle for some time. SOFTWARE/OS VERSIONS Operating System: KDE neon 5.21 KDE Plasma Version: 5.21.2 KDE Frameworks Version: 5.79.0 Qt Version: 5.15.2 Kernel Version: 5.4.0-66-generic OS Type: 64-bit Graphics Platform: X11 Processors: 4 × Intel® Core™ i3-5010U CPU @ 2.10GHz Memory: 3.8 GiB of RAM Graphics Processor: Mesa Intel® HD Graphics 5500 ADDITIONAL INFORMATION The issue is also present in SDDM login screen.
Confirmed, the password is left in the box and is not cleared. While it is the user's responsibility to keep their machine secure I do feel that sane defaults should improve the user's security without impacting their experience. I believe a default timeout needs to be implemented to assist users with keeping their machines secure. As for SDDM that is not a KDE project. I'd suggest submitting a request on their bug tracker for that.
A possibly relevant merge request was started @ https://invent.kde.org/plasma/plasma-workspace/-/merge_requests/724