[plasmashell] [Bug 424707] New: On HiDPI screens SDDM theme layout is too compact

[Oded Arbel]

https://bugs.kde.org/show_bug.cgi?id=424707

            Bug ID: 424707
           Summary: On HiDPI screens SDDM theme layout is too compact
           Product: plasmashell
           Version: master
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Theme - Breeze
          Assignee: visual-design at kde.org
          Reporter: oded at geek.co.il
                CC: plasma-bugs at kde.org
  Target Milestone: 1.0

Created attachment 130429
  --> https://bugs.kde.org/attachment.cgi?id=130429&action=edit
Screenshot showing the problem

SUMMARY
When using UHD (HiDPI) screens, the login screen correctly scales the text and
other UI elements, but does not change the layout and as a result the graphical
elements overlap each other and the text is not readable. See screenshot.

STEPS TO REPRODUCE
1. Connect a HiDPI screen (2160p or more)
2. Restart SDDM

OBSERVED RESULT
Graphical elements overlap each other including the text of user names and
such.

EXPECTED RESULT
Graphical elements should be clearly identifiable and separate.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 5.19.80
KDE Frameworks Version: 5.73.0
Qt Version: 5.14.2

ADDITIONAL INFORMATION
Running Kubuntu with neon developer edition (unstable) repositories.

I'm using 2 external UHD screens in addition to the laptop screen. Here's the
xrandr output for SDDM:

Screen 0: minimum 320 x 200, current 7680 x 2160, maximum 16384 x 16384
eDP-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y
axis) 346mm x 194mm
   1920x1080     59.93*+
...
DP-1 disconnected (normal left inverted right x axis y axis)
HDMI-1 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
HDMI-2 disconnected (normal left inverted right x axis y axis)
DP-1-1 disconnected (normal left inverted right x axis y axis)
DP-1-2 connected 3840x2160+0+0 (normal left inverted right x axis y axis) 609mm
x 349mm
   3840x2160     60.00*+  29.98  
   2560x1440     59.95  
   2048x1280     59.99  
   1920x1200     59.88  
   2048x1080     24.00  
   1920x1080     60.00    60.00    50.00    59.94    24.00    23.98  
...
DP-1-3 disconnected (normal left inverted right x axis y axis)
DP-2-1 disconnected (normal left inverted right x axis y axis)
DP-2-2 connected 3840x2160+3840+0 (normal left inverted right x axis y axis)
609mm x 349mm
   3840x2160     60.00*+  29.98  
   2560x1440     59.95  
   2048x1280     59.99  
   1920x1200     59.88  
   2048x1080     24.00  
   1920x1080     60.00    60.00    50.00    59.94    24.00    23.98  
...
DP-2-3 disconnected (normal left inverted right x axis y axis)

Also note that the laptop screen (eDP-1) shows a clipped area of on of the
HiDPI screens instead of its own, which is another issue altogether.

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