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The most common case for Clutter is 2D axis-aligned actors, which maintain these properties even after projecting to eye coordinates. In those cases, we can use a simpler hit test by checking against boxes. Not only this is simpler, but this maintains an important aspect of picking that is a requirement for Clutter: watertightness. Even though the triangles checks do work on x86_64, they do not guarantee watertightness. This breaks tests on ARM. Use graphene_box_t to hit-test axis-aligned 2D actors. Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1599>