Fix for unread syncs and ooo reactions

ts/util/StartupQueue.ts

@@ -0,0 +1,30 @@
+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+export class StartupQueue {
+  set: Set<string>;
+
+  items: Array<() => void>;
+
+  constructor() {
+    this.set = new Set();
+    this.items = [];
+  }
+
+  add(id: string, f: () => void): void {
+    if (this.set.has(id)) {
+      return;
+    }
+
+    this.items.push(f);
+    this.set.add(id);
+  }
+
+  flush(): void {
+    const { items } = this;
+    window.log.info('StartupQueue: Processing', items.length, 'actions');
+    items.forEach(f => f());
+    this.items = [];
+    this.set.clear();
+  }
+}