io/socket: discard sockets which have failed to connect

Fixes future connection attempts.

changelog/next.md

@@ -12,3 +12,4 @@
 - Fixed `NotificationAction.text` not accepting text updates.
 - Fixed PipeWire route volume writes for devices without a reported volume step.
 - Fixed a crash when quitting or reloading while a `Loader` was still loading asynchronously.
+- Fixed future `Socket` connection attempts after a failed connection attempt.

src/io/socket.cpp

@@ -73,6 +73,13 @@ void Socket::onSocketDisconnected() {
 void Socket::onSocketError(QLocalSocket::LocalSocketError error) {
 	qCWarning(logSocket) << "Socket error for" << this << error;
 	emit this->error(error);
+
+	if (!this->connected) {
+		QObject::disconnect(this->socket, nullptr, this, nullptr);
+		this->socket->deleteLater();
+		this->socket = nullptr;
+		this->disconnecting = false;
+	}
 }
 
 bool Socket::isConnected() const { return this->connected; }