The mini player reported its frame inside the main window's scaled-down
content, so the morph aimed short of where it ends up once the scale
animates back. The scaled content also had a smaller bottom safe area
(UIKit derives it from the transformed frame) that only came back on the
next layout, lifting the mini player 2pt after the morph landed. Map the
target out of the scale, account for the safe area it gets back, and
re-lay the main window out as the morph starts.
41fb54d278