AutoHotkey Community

https://www.autohotkey.com/docs/v2/lib/OnMessage.htm#ExLButtonDown
skibidi fr

OnMessage example doesn't support negative x, y coordinates

Yes, because the example was added in 2005, when only one monitor was usually used and therefore negative coordinates were irrelevant. If you want this example to take this into account, you need to make a specific suggestion for improvement, as the example itself is not wrong.