Change: Queue content ID information requests. (#13990)

Instead of requesting content one ID at a time, queue them up to be requested in one go.

* Avoids sending many small requests.
* Avoids sending requests for content which is likely to be arriving anyway.

src/timer/timer_window.cpp

@@ -43,8 +43,8 @@ void TimeoutTimer<TimerWindow>::Elapsed(TimerWindow::TElapsed delta)
 	this->storage.elapsed += delta;
 
 	if (this->storage.elapsed >= this->period) {
-		this->callback();
 		this->fired = true;
+		this->callback();
 	}
 }