It was yet more complex and dynamic than I thought: https://www.cnet.com/tech/mobile/iphone-keyboard-learns-what-you-type-dynamically-resizes-key-hot-zones/ ht

It was yet more complex and dynamic than I thought: https://www.cnet.com/tech/mobile/iphone-keyboard-learns-what-you-type-dynamically-resizes-key-hot-zones/ https://www.cnet.com/tech/mobile/iphone-keyboard-learns-what... I'd assume the dynamic hot zone resizing do sn't apply for third party keyboards, but honestly I have no idea.