Live Activity Content Density

Nucleic-Session: B3643133-163C-4C5D-BE20-1A6B7FB83DA9
Co-authored-by: Nucleic <[email protected]>

NucleicRemote/NucleicRemote/LiveActivityManager.swift

@@ -68,23 +68,52 @@ final class LiveActivityManager {
             linesRemoved: removed,
             lines: Array(lines))
 
-        if let activity {
-            Task { await activity.update(ActivityContent(state: state, staleDate: nil)) }
-        } else {
-            // Recover an Activity that survived an app relaunch before starting a new one.
+        push(state, hostName: hostName)
+    }
+
+    /// Apply `state` to the Activity — deduped against the last push and coalesced through one
+    /// serial task so the newest state always wins.
+    private func push(_ state: NucleicSessionAttributes.ContentState, hostName: String) {
+        guard state != lastState else { return }
+        lastState = state
+
+        guard let activity else {
+            // Recover an Activity that survived an app relaunch before starting a new one; the
+            // recovered one still needs the fresh state, so fall through to the update pipeline.
             if let existing = Activity<NucleicSessionAttributes>.activities.first {
                 activity = existing
-                Task { await existing.update(ActivityContent(state: state, staleDate: nil)) }
-                return
-            }
+                enqueue(state)
+            } else {
                 activity = try? Activity.request(
                     attributes: NucleicSessionAttributes(hostName: hostName),
                     content: ActivityContent(state: state, staleDate: nil))
             }
+            return
+        }
+        _ = activity
+        enqueue(state)
+    }
+
+    /// Hand the newest state to the serial drainer (starting it if idle).
+    private func enqueue(_ state: NucleicSessionAttributes.ContentState) {
+        pendingState = state
+        guard updateTask == nil else { return }  // the running drainer will pick this up
+        updateTask = Task { @MainActor [weak self] in
+            guard let self else { return }
+            while let next = self.pendingState {
+                self.pendingState = nil
+                await self.activity?.update(ActivityContent(state: next, staleDate: nil))
+            }
+            self.updateTask = nil
+        }
     }
 
     /// End the Activity (all idle, or unpaired).
     func end() {
+        updateTask?.cancel()
+        updateTask = nil
+        pendingState = nil
+        lastState = nil
         guard let activity else { return }
         self.activity = nil
         Task {