IMO auto scale doesn't have much sense on desktop computers, because advanced lighting was enabled by default for a long time and graphics level 3 should be fast enough as it is. And still now rtts scale it's easily configurable in options.
I fixed deactivated "render resolution" spinner when you enter graphics options when advanced lighting is disabled.
I also added a function that reads dpi on android and it sets rtts scale based on this value. SDL is not initialized yet in this place, so getDisplayDPI() is not possible.
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