Zhiyi Zhang (@zhiyi) commented about dlls/win32u/sysparams.c:
{
if (!(monitor = calloc( 1, sizeof(*monitor) ))) break;if (!read_monitor_settings( adapter, monitor_id, monitor )){free( monitor );break;}
struct monitor *monitor;if (!read_adapter_monitor_path( hkey, monitor_id, path )) break;if (!(monitor = find_monitor_from_path( path ))) continue; monitor->id = monitor_id; monitor->adapter = adapter_acquire( adapter );monitor->handle = UlongToHandle( ++monitor_count );adapter->monitor_count++;
Now that we have a monitor count in the adapter. Flagging a monitor as a clone doesn't need to loop over the monitor list. Any monitors within the same adapter but the first is a clone.