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19e5f072b5
The server refuses to send a task to a plugin whose last heartbeat is older than 30 s, taking its tab for frozen. The plugin sent heartbeats only from a 10 s timer, and Chrome runs the timers of a hidden page as rarely as once a minute: without Energy Saver after about a minute hidden, and at once with it. A Penpot tab hidden for a minute therefore failed that check about half the time, although it could run tasks. Chrome handles socket messages of a hidden page at once, and a frozen page cannot handle them at all. The server now sends each plugin a heartbeat request every 10 s, and the plugin answers it with a heartbeat, so the heartbeat age again tells a frozen tab from a hidden one. The plugin keeps its timer, so it still sends heartbeats to a server that does not ask. A plugin that does not know the request passes it to the plugin code, which ignores it.