// and this tripped me up at first. But in fact, what we want is the root view, because we need to
// make the y origin relative to the very top of the window, not its contents, since we later flip
// the y coordinate for Cocoa.
// and this tripped me up at first. But in fact, what we want is the root view, because we need to
// make the y origin relative to the very top of the window, not its contents, since we later flip
// the y coordinate for Cocoa.