https://developer.apple.com/documentation/appkit/nsevent
set var1 to current application's NSEvent's pressedMouseButtons()
say var1
set var1 to current application's NSEvent's buttonNumber()
say var1
First one works, but second one doesn't work, how to solve it?
[AppDelegate main:]: +[NSEvent buttonNumber]: unrecognized selector sent to class 0x7fffb09df330 (error -10000)