[Bug 1908932] [NEW] Kubuntu 20.04 system settings add languages window maximized at 4K UHD quickly flashes

[Martin Bruzina]

Public bug reported:

Let's try with fresh install: Kubuntu 20.04.1 with default installer
options + all packages updated, upgraded, systemsettings package version
4:5.18.4.1-0ubuntu1:

- Go to System Settings -> Regional Settings -> Language
- (I am not sure this step is necessary): add additional three languages (in my case cz, sk, ru)
- Maximize window at 4K UHD (3840x2160) display without any Plasma panel, the window occupies a whole area of the display
- Click the button Add languages...

Expected result:
- Add languages window shows languages list and after initial render stays static

Actual result:
- Add languages window flashes quickly, blinking indefinitely
- Just restore or resize the window to stop it

** Affects: systemsettings (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1908932

Title:
  Kubuntu 20.04 system settings add languages window maximized at 4K UHD
  quickly flashes

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