This variable can be removed since with scene-graph wlr_presentation_surface_sampled_on_output no longer needs to be called.
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static struct wlr_presentation *presentation;
presentation = wlr_presentation_create(dpy, backend); wlr_scene_set_presentation(scene, presentation);
presentation = wlr_presentation_create(dpy, backend);
wlr_scene_set_presentation(scene, presentation);
wlr_scene_set_presentation(scene, wlr_presentation_create(dpy, backend));