This post is from the Activity iPhone Duo UIKit Q&A.
On the folded phone the keyboard resizes our edge-to-edge sheet. On the inner display the sheet is inset, and keyboardFrameEnd in screen coordinates no longer lines up with the sheet’s container, so input fields stay covered. Should we convert the keyboard frame into the sheet’s coordinate space, and does keyboardLayoutGuide follow the sheet or the screen on iPhone Duo?