Confirm power and logout actions in centered system modals

compositor/src/state.rs

@@ -257,6 +257,8 @@ pub struct Ferese {
     pub(crate) overview_scrims: HashMap<OutputId, crate::winit::OverviewScrim>,
     pub(crate) material_programs: HashMap<ErasedContextId, crate::winit::MaterialProgram>,
     pub(crate) material_buffers: HashMap<WlSurface, crate::winit::MaterialBuffers>,
+    pub(crate) pending_logout: Option<u32>,
+    pub(crate) logout_owner: Option<smithay::reexports::wayland_server::backend::ObjectId>,
     pub(crate) blur_programs: HashMap<ErasedContextId, crate::winit::BlurProgram>,
     pub(crate) backdrop_generation: u64,
     closing_windows: HashMap<WindowId, ClosingAnimation>,
@@ -478,6 +480,8 @@ impl Ferese {
             overview_scrims: HashMap::new(),
             material_programs: HashMap::new(),
             material_buffers: HashMap::new(),
+            pending_logout: None,
+            logout_owner: None,
             blur_programs: HashMap::new(),
             backdrop_generation: 0,
             closing_windows: HashMap::new(),