Draft: backend/drm: move pending layer FB to wlr_drm_connector_state
Introduce struct wlr_drm_layer_state to hold temporary per-commit layer state. Store pending FBs there, to mirror wlr_drm_connector_state.primary_fb.
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Introduce struct wlr_drm_layer_state to hold temporary per-commit layer state. Store pending FBs there, to mirror wlr_drm_connector_state.primary_fb.