with Arduino IDE 1.x (Teensyduino) on macOS, I used to modify teensy's core source files in the app package's "java" folder. With IDE 2.0 however, there is no such folder in the app package anymore. Where can I find those files now?
Note that on MacOS Ventura, the Library folder is normally hidden and you will need to press CMD-SHIFT-period to make hidden files visible in the Finder.