SUMMARY
First,not possible to change self password,even after providing correct root password.No error displayed after root password is given.'Apply' just greys out.But the password remains unchanged.

STEPS TO REPRODUCE
1. System Settings > User Account Details >User Manager
2. click on change password,password is asked,give password
3. When apply is clicked,root password is asked,upon providing dialog closes and 'apply' greys out.
4.Try logout > Re-login.New password is not set.

It is actually bad to ask root password to change one's own password.Over that,still password is not set.

Also,this module lists all other users even as the user running the module is a normal user. Even other options of enabling system administration for the user are bad in this context.If at all that has to be given,then separate that choice from changing own password.

OBSERVED RESULT


EXPECTED RESULT


SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION
Running Opensuse Tumbleweed