By making the cursor invisible (instead of disabling it), the lightgun will work perfectly in fullscreen mode. This change makes "fullscreen_window" aka "fakefullscreen", and other lightgun hacks, completely unnecessary. I tested on Xubuntu 20.04 x64 and Mate 20.04 arm64, playing Mad Dog. I don't know if it will work on Windows. It does not affect the game when playing using the mouse.
By making the cursor invisible (instead of disabling it), the lightgun will work perfectly in fullscreen mode. This change makes "fullscreen_window" aka "fakefullscreen", and other lightgun hacks, completely unnecessary. I tested on Xubuntu 20.04 x64 and Mate 20.04 arm64, playing Mad Dog. I don't know if it will work on Windows. It does not affect the game when playing using the mouse.