Flutter Web Multi-Tab Chaos: How Leader Election Keeps Polling Under Control

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When users open a Flutter web app in multiple browser tabs, each tab independently polls the server, multiplying network requests and causing duplicate actions for a single user. The browser's built-in BroadcastChannel API enables inter-tab messaging but offers no native support for tab counting or designating a single active tab. A leader election pattern solves this by assigning one tab — typically the oldest — to handle server communication like polling or WebSocket connections, while others remain passive. If the leading tab closes gracefully or crashes, a new leader is automatically elected using a combination of tab age and ID to ensure a consistent, total ordering. This approach is fully testable within a single Dart VM and works correctly on non-web platforms by defaulting to single-tab behavior, eliminating the need for platform-specific code branches.

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