Coalesce overlapping task-list reloads from streamed events

mac/Sources/Byre/Store.swift

@@ -87,6 +87,8 @@ final class Store {
     private var taskFeeds: [String: Feed] = [:]
     @ObservationIgnored private var historyLoads: Set<ObjectIdentifier> = []
     @ObservationIgnored private var requestSeqs: [String: Int] = [:]
+    @ObservationIgnored private var taskReloads: Set<String> = []
+    @ObservationIgnored private var taskReloadAgain: Set<String> = []
     @ObservationIgnored private var terminalChanges = 0
     @ObservationIgnored private var globalStream: EventStream?
     @ObservationIgnored private var leadStream: EventStream?
@@ -367,6 +369,29 @@ final class Store {
         }
     }
 
+    private func reloadTasks(_ projectId: String) async throws {
+        guard taskReloads.insert(projectId).inserted else {
+            taskReloadAgain.insert(projectId)
+            return
+        }
+        defer {
+            taskReloads.remove(projectId)
+            taskReloadAgain.remove(projectId)
+        }
+        var failure: (any Error)?
+        repeat {
+            taskReloadAgain.remove(projectId)
+            do {
+                try await loadTasks(projectId)
+            } catch {
+                failure = error
+            }
+        } while taskReloadAgain.contains(projectId)
+        if let failure {
+            throw failure
+        }
+    }
+
     func loadSessions(_ taskId: String) async throws {
         let latest = claimRequest("sessions:\(taskId)")
         let list = try await api.client.listSessions(path: .init(taskId: taskId)).ok.body.json
@@ -709,7 +734,7 @@ final class Store {
             notifyTask(self, ev)
             if let projectId = ev.projectId {
                 spawn("load tasks") {
-                    try await self.loadTasks(projectId)
+                    try await self.reloadTasks(projectId)
                 }
             }
         case "session.created", "session.state", "session.subagents", "session.model":
@@ -732,7 +757,7 @@ final class Store {
             }
             if let projectId = ev.projectId {
                 spawn("load tasks") {
-                    try await self.loadTasks(projectId)
+                    try await self.reloadTasks(projectId)
                 }
             }
         case "inbox.updated":
@@ -750,7 +775,7 @@ final class Store {
             notifyError(self, ev)
             if let projectId = ev.projectId {
                 spawn("load tasks") {
-                    try await self.loadTasks(projectId)
+                    try await self.reloadTasks(projectId)
                 }
             }
         case "task.merge_facts":