[Cin] Dual-screen support was working in cinCV at least

Managed to get qemu (v7.2.0-334-g959b27f577-dirty) running with two virtual displays qemu-system-x86_64 -enable-kvm -m 2000 -cpu qemu64 -device virtio-vga,max_outputs=2 -device virtio-vga -cdrom /home/admin/CDROM-4.14.246-big-7.iso -smp 2 -device usb-mouse -M q35 -usb then in running system I run xconf (script configuring X from old Slax 6) and then startx bring me two displays. first i send xterm to second display by using DISPLAY=":0.1" from there I launchd cinelerra I typed :0.0 in CinCV's output config tab, and on next startup Compositor was on original first display..