Before the fix, selecting "USB" (it's selected by default) in the
"Connect to device" dialog would incorrectly set a conn parameter to
some serial or HID devices, even for scans for pure USB devices which are
neither of those.
This fixes bug #1403.
serial_config_layout->addWidget(&serial_devices_);
serial_config_layout->addWidget(&serial_baudrate_);
serial_config_layout->addWidget(new QLabel("baud"));
+ serial_config_->setEnabled(false);
tcp_config_ = new QWidget();
QHBoxLayout *tcp_config_layout = new QHBoxLayout(tcp_config_);