Unreadable text with Qt dark theme

Basically, the same issue as: https://github.com/Swordfish90/cool-retro-term/issues/637

On KDE Plasma with a dark theme, the SDL2 Gamepad Mapper will have unreadable text, with foreground text color equal to the background color.

Screenshot

As a quick workaround, setting the env var QT_QUICK_CONTROLS_STYLE=Universal:

Second screenshot