This option would change between light and dark mode depending on the Windows 10/11 setting.

I primarily want this as I use f.lux to automatically enable dark mode at night, but otherwise use light mode during the day. Now that N++ can switch without restarting, it can automatically follow this setting like most of my other apps (and even a lot of websites nowadays!).

Also once dark mode is finalised, this could be enabled by default to automatically use dark mode for users that have already indicated in Windows that they want apps to be dark.