Not all QNetworkAccessManager::get() calls trigger an error when they should

When a get() call fails due to the connection being refused then if there are other get() calls pending with the same url the error is not received by all of them. This is because it only emits the 2nd error out of the two while doing the first check, it ignores the other failures that happen at the same time as it just closes them off.

Attached is an example that reproduces the problem, note that when the fourth one fails it triggers the slot for the 2nd one as that one is the oldest one pending and it assumes that is the one that failed.