Created attachment 157440 [details]
Screenshot showing scaling artifacts

SUMMARY
On Wayland, when using the Plastik window decorations at non-100% (or at least non-integer) scaling, the window title has scaling artifacts (see attached screenshot).

STEPS TO REPRODUCE
1. Use Plasma Wayland session
2. Set screen to use 150% scaling
3. Switch to Plastik window decorations

OBSERVED RESULT
The window title has scaling artifacts, like it was rendered at 100% and then upscaled to 150%.

EXPECTED RESULT
The text is rendered smoothly, like when using Breeze decorations.

SOFTWARE/OS VERSIONS
Operating System: NixOS 23.05
KDE Plasma Version: 5.27.3
KDE Frameworks Version: 5.104.0
Qt Version: 5.15.8
Kernel Version: 6.1.19 (64-bit)
Graphics Platform: Wayland
Processors: 12 × AMD Ryzen 5 5600X 6-Core Processor
Memory: 23.4 GiB of RAM
Graphics Processor: AMD Radeon RX Vega

ADDITIONAL INFORMATION