On an iPad the controls pill sat two to three times further from the bottom of
the screen than from the left, so it read as floating rather than tucked into
the corner. `safeAreaInset` places its content INSIDE the safe area, so the
pill's bottom margin was stacking on top of the device's own ~24 pt
home-indicator inset while the leading margin had nothing to stack on.
Subtracting that inset is the fix; GETTING the inset is where this commit's
history is. Three spellings failed before this one, each silently:
- a `GeometryReader` carrying `.ignoresSafeArea()` — a proxy reports no
inset for an edge it has been told to ignore, so it can only answer 0;
- `.ignoresSafeArea(.container, edges: .bottom)` on the inset CONTENT,
which does not move content the inset mechanism itself placed;
- asking UIKit for the key window (`UIApplication.shared.connectedScenes…`)
DURING body — which answers the right number and then KILLS the asking
view. On a physical iPad (never the simulator) that walk re-enters UIKit
layout mid-render and SwiftUI silently severs the view's update graph:
from then on every `@State` write lands in storage without `body` ever
running again. That is exactly how Settings and Add Host stopped opening
while their triggers kept firing and `showSettings` kept reading true —
no AttributeGraph warning, nothing in the log. Found by bisecting device
builds; a build that opens the screen programmatically renders green with
input-driven navigation completely dead, so only a real press counts.
So the inset is measured where it is knowable: DisplayBottomInsetProbe, a
UIView that reads its WINDOW's inset from UIKit's own callbacks
(didMoveToWindow / safeAreaInsetsDidChange / layoutSubviews), hops out of the
current update, and publishes through `\.displayBottomInset` from ContentView.
The legend reads the environment — proven safe on glass — and
`gamepadLegendBottomPadding` is pure arithmetic.
Tablets only. The padding goes negative to pull the pill back down through the
indicator strip, which is safe there because the pill is left-aligned and an
iPad's indicator is a short bar in the middle. A phone's indicator is taller
and its legend runs most of the width, so the same move would cross it —
phones keep the plain margin, and the tier comes from the size classes, so an
iPad in a narrow Stage Manager window is treated as the in-hand case it is.
macOS + tvOS typecheck; margins and Settings/Add Host opening from a real
controller press verified on the iPad itself.
enricobuehler
8ef5350431