[plasmashell] [Bug 433563] SDDM & Lock screen themes: Password field input not synced across screens

[Dennis Schridde]

https://bugs.kde.org/show_bug.cgi?id=433563

--- Comment #11 from Dennis Schridde <dschridde+kde at mailbox.org> ---
Copied from bug #492502:

SUMMARY

It would be nice if there was (at least) an option to mirror the password field
on the screen saver / screen lock across all screens, such that when I type it
in, it will be shown on all screens.

This would solve my problem where with multiple screens, when waking up the
screens, the first time I enter the password unlocking will fail.

STEPS TO REPRODUCE

1. Allow screen to go to sleep
2. Shake mouse
3. Wait until first screen wakes up and presents the password prompt
4. Start typing the password
5. The 2nd screen will be turned on a second (or so) later
6. Now the 2nd half of the password will be entered on the 2nd screen's
password prompt input field
7. When you press enter to unlock the computer, the password will be rejected
(part of it was entered into one input field and part of it into the other)

OBSERVED RESULT

Unlock gets rejected.

EXPECTED RESULT

Password gets input into the password field on all screens and unlock succeeds.

SOFTWARE/OS VERSIONS

Operating System: NixOS 24.05
KDE Plasma Version: 6.0.5
KDE Frameworks Version: 6.2.0
Qt Version: 6.7.2
Kernel Version: 6.10.6 (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 9 6900HS with Radeon Graphics
Memory: 30,6 GiB of RAM
Graphics Processor: AMD Radeon Graphics

ADDITIONAL INFORMATION

This is related to following existing reports:
* bug #409226 (this is an alternative way to solve the problem: instead of
entering the password on all screens, show the prompt only on one of them)
* bug #488516 (this suggests that there might be 2 problem involved: the
password being split, but also the first characters being missing)

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