[plasmashell] [Bug 426591] New: Plasma doesn't respect resolution for wallpaper. Splash screen is in other resolution and desktop objects are misaligned

[Nick Stefanov]

https://bugs.kde.org/show_bug.cgi?id=426591

            Bug ID: 426591
           Summary: Plasma doesn't respect resolution for wallpaper.
                    Splash screen is in other resolution and desktop
                    objects are misaligned
           Product: plasmashell
           Version: 5.19.5
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: k...@davidedmundson.co.uk
          Reporter: m...@abv.bg
                CC: plasma-b...@kde.org
  Target Milestone: 1.0

SUMMARY
Plasma doesn't respect resolution for wallpaper. My resolution is lower than
the native one for my monitor. I use 1280x800 but the wallpaper is 1920x1080.
The result is I see wallpaper's upper left corner. Positioning is Scaled and
Cropped but this doesn't work at all. I tried all positioning options to no
avail.

https://i.imgur.com/4O3IdTb.png

When I enter in Customize Layout mode, the upper options pannel is misaligned.
It's not in the middle but in right and I can't close it:

https://i.imgur.com/IjLYnq0.png

Despite the resolution set (1280x800), when I restart the PC, the splash screen
uses my native monitor resolution (2560x1440) and then, when it comes to
desktop, it switches to 1280x800 and I think this is the culprit.

I use Display Port interface and tried to HDMI - same result. I tried different
DEs like Deepin, Xfce, Cinnamon and MATE on the same machine with the same
profile and all of them are working fine. It's just Plasma. I tried latest
NVIDIA Vulkan beta drivers to no avail. I deleted all video settings and
xorg.conf, changing resolutions from Display Settings and NVIDIA panel -
nothing helps.

The only way I found to scale the wallpaper is 

kquitapp5 plasmashell && kstart5 plasmashell

Then the wallpaper is looking fine:

https://i.imgur.com/ZTHXT3f.png

Edit mode too:

https://i.imgur.com/PUBzUTC.png

STEPS TO REPRODUCE
1. Set resolution lower than the monitor's native resolution.
2. 
3. 

OBSERVED RESULT
The splash screen is still in native resolution and it switches to wanted
resolution later. Some objects and the wallpaper are misaligned.

EXPECTED RESULT
Splash screen have to use the resolution that user set in Display settings.
Wallpaper have to be whole, not part of it. Opjects shouldn't misaligned.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma
KDE Plasma Version: 5.19.5
KDE Frameworks Version: 5.74
Qt Version: 5.15.1

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