[Approved] Plasma 6 proposal: remove the ability to set the font DPI on Wayland
Previously discussed at teams/vdg/issues#16 (closed), but I'm moving it here for more visibility, since this is the better place for it.
This setting's existence contributes mightily to scaling feeling buggy and broken, since it's yet another knob people can twist to scale the system, but they won't understand its consequences, and it will interact poorly with other scaling options also in use.
We tried to remove it before (see plasma-workspace!270 (merged)) for Plasma 5.21 but people complained that they were using it to work around the blurry fractional scaling, which at the time seemed reasonable, so we reverted the change (see plasma-workspace!669 (merged)). However that's fixed in Plasma 6, at least for Qt and SDL apps.