Nodes and scale factors

[amolenaar]

Hi,

I'm working on the macOS backend for GTK (4). When I enable the option "Full Keyboard Access" in the system preferences, a bounding box is drawn around the focused widget by the OS. On screens with a scale factor > 1 this results in the bounding boxes being misplaced.

What is the right way to report node bounding boxes? Should they be defined in screen pixels or is there some other way to deal with the scaling factor?

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• GTK issue: https://gitlab.gnome.org/GNOME/gtk/-/issues/7774
• Proposed solution (MR): https://gitlab.gnome.org/GNOME/gtk/-/merge_requests/8990

[matthiasclasen]

The ideal answer here would be independent of the OS, so we don't have to litter the GTK AccessKit backend with ifdefs