In Xcode 13.0, after doing a side-by-side code review (by clicking on the double arrow icon at the top right of the editor), and then turning code review off (clicking that icon again), I'm still left with the blue text highlights showing the changed lines. The only way to get rid of the highlights is to select a different source code file in the project navigator and then return to the original file. Is it just me, or should I submit a bug report via Feedback?

I have a USB modem that worked fine under Mojave. With Big Sur (11.2.3), the device is not recognized immediately after a restart (/dev/cu.usbmodem123456781 does not exist). However, if I unplug the device and then replug into the USB port, /dev/cu.usbmodem123456781 exists and can be used. I'm accessing the device programmatically in a macOS app, using Objective-C. After a restart, System Report correctly lists the USB modem (even before unplug/replug) as follows: USB Modem:   Product ID: 0x1340   Vendor ID: 0x0572 (Conexant Systems, Inc.)   Version: 1.00   Serial Number: 12345678   Speed: Up to 12 Mb/s   Manufacturer: Conexant   Location ID: 0x14110000 / 5   Current Available (mA): 500   Extra Operating Current (mA): 0 What can I do so that /dev/cu.usbmodem123456781 exists after a restart?