Two fixed delays into the keyboard's animation is not where it ends: the
composer read the viewport mid-slide, and on the way out - when the navbar
comes back - nothing re-measured at all, so the panel stayed pushed up or
sat back under the bar. In a sidedock drawer no resize event fires either,
so a phone's keyboard moved nothing there.
The inset is now re-measured every frame until the reading holds still, and
blur is a trigger as much as focus. `inset()` returns what it wrote so the
loop can tell it has settled rather than counting milliseconds.
hh
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