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kcms/krdb: Provide scaled Xcursor.size on Wayland

Vlad Zahorodnii requested to merge work/zzag/stop-setting-xcursor-theme-size into master

Cursor size is specified in different coordinate spaces on Wayland and X11. Wayland uses logical pixels, while X11 uses native pixels.

Due to X11 using native pixels, we need to provide an upscaled cursor size in Wayland session to match the cursor size in Wayland apps.

That's not possible while plasma sets the XCURSOR_SIZE environment variable, which applies both to X11 and Wayland apps.

Besides that, the environment variable is not a good way to propagate the settings in general as it's not possible to get notified when the environment variables change.

The cursor size must be scaled similar to other UI elements.

Edited by Vlad Zahorodnii

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