config: add XWayland enabled option

src/state.rs

@@ -313,6 +313,7 @@ pub struct ScreenlockState {
 
 pub struct XWaylandState {
     pub enabled: Cell<bool>,
+    pub running: Cell<bool>,
     pub pidfd: CloneCell<Option<Rc<OwnedFd>>>,
     pub handler: RefCell<Option<SpawnedFuture<()>>>,
     pub queue: Rc<AsyncQueue<XWaylandEvent>>,
@@ -968,6 +969,24 @@ impl State {
         }
     }
 
+    pub fn stop_xwayland(&self) {
+        if self.xwayland.running.get() {
+            return;
+        }
+        self.xwayland.handler.take();
+    }
+
+    pub fn set_xwayland_enabled(self: &Rc<Self>, enabled: bool) {
+        if self.xwayland.enabled.replace(enabled) == enabled {
+            return;
+        }
+        if enabled {
+            self.start_xwayland();
+        } else {
+            self.stop_xwayland();
+        }
+    }
+
     pub fn next_serial(&self, client: Option<&Client>) -> u64 {
         let serial = self.serial.fetch_add(1);
         if let Some(client) = client {