https://bugs.kde.org/show_bug.cgi?id=403314

            Bug ID: 403314
           Summary: screenlocker configuration module performance issue if
                    not started from system settings
           Product: systemsettings
           Version: 5.14.4
          Platform: Manjaro
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: kcmshell
          Assignee: kdelibs-b...@kde.org
          Reporter: gianni_2...@hotmail.it
  Target Milestone: ---

Created attachment 117512
  --> https://bugs.kde.org/attachment.cgi?id=117512&action=edit
Video showing difference between opening with systemsettings5 and standalone

SUMMARY

When I try to set a wallpaper for the lock-screen, if I access the screenlocker
module from system settings I can choose an image normally, but if I start the
screenlocker module "standalone" (eg. from the command line or from krunner)
and select the "Aspect" tab when I try to resize it or scroll it, it shows
severe ""redrawing"" problems.

STEPS TO REPRODUCE
1. Open terminal and execute "kcmshell5 screenlocker"
2. Select "Aspect" tab
3. Try to resize the window or scroll through the images

OBSERVED RESULT
The screenlocker window doesn't redraw itself like it does when accessed from
the system settings.

EXPECTED RESULT
The screenlocker module opened standalone should redraw itself as good as it
does when opened from system settings.

SOFTWARE/OS VERSIONS

Linux/KDE Plasma: Manjaro Linux
KDE Plasma Version: Plasma 5.14.4
KDE Frameworks Version: 5.53.0
Qt Version: 5.12.0

ADDITIONAL INFORMATION
I am appending a video showing the described issue (note: the window gets
updated eventually, it was just taking too long so I cut the video)

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