Implement primary selecton

Firefox clipboard doesn't always work without it.

src/handlers/mod.rs

@@ -14,9 +14,10 @@ use smithay::wayland::data_device::{
     ServerDndGrabHandler,
 };
 use smithay::wayland::dmabuf::{DmabufGlobal, DmabufHandler, DmabufState, ImportError};
+use smithay::wayland::primary_selection::{PrimarySelectionHandler, PrimarySelectionState};
 use smithay::{
     delegate_data_device, delegate_dmabuf, delegate_output, delegate_pointer_gestures,
-    delegate_presentation, delegate_seat, delegate_tablet_manager,
+    delegate_presentation, delegate_primary_selection, delegate_seat, delegate_tablet_manager,
 };
 
 use crate::niri::State;
@@ -75,6 +76,15 @@ impl ServerDndGrabHandler for State {}
 
 delegate_data_device!(State);
 
+impl PrimarySelectionHandler for State {
+    type SelectionUserData = ();
+
+    fn primary_selection_state(&self) -> &PrimarySelectionState {
+        &self.niri.primary_selection_state
+    }
+}
+delegate_primary_selection!(State);
+
 delegate_output!(State);
 
 delegate_presentation!(State);

src/niri.rs

@@ -53,6 +53,7 @@ use smithay::wayland::dmabuf::DmabufFeedback;
 use smithay::wayland::output::OutputManagerState;
 use smithay::wayland::pointer_gestures::PointerGesturesState;
 use smithay::wayland::presentation::PresentationState;
+use smithay::wayland::primary_selection::PrimarySelectionState;
 use smithay::wayland::shell::wlr_layer::{Layer, WlrLayerShellState};
 use smithay::wayland::shell::xdg::decoration::XdgDecorationState;
 use smithay::wayland::shell::xdg::XdgShellState;
@@ -103,6 +104,7 @@ pub struct Niri {
     pub tablet_state: TabletManagerState,
     pub pointer_gestures_state: PointerGesturesState,
     pub data_device_state: DataDeviceState,
+    pub primary_selection_state: PrimarySelectionState,
     pub popups: PopupManager,
     pub presentation_state: PresentationState,
 
@@ -243,6 +245,7 @@ impl Niri {
         let tablet_state = TabletManagerState::new::<State>(&display_handle);
         let pointer_gestures_state = PointerGesturesState::new::<State>(&display_handle);
         let data_device_state = DataDeviceState::new::<State>(&display_handle);
+        let primary_selection_state = PrimarySelectionState::new::<State>(&display_handle);
         let presentation_state =
             PresentationState::new::<State>(&display_handle, CLOCK_MONOTONIC as u32);
 
@@ -593,6 +596,7 @@ impl Niri {
             tablet_state,
             pointer_gestures_state,
             data_device_state,
+            primary_selection_state,
             popups: PopupManager::default(),
             presentation_state,