On Android Automotive head units with a left- or right-positioned system
bar, the whole edge of the app rendered underneath it: Discover's title,
hero text and first card were clipped, and the player controls sat under
the bar. Play's car app quality AR-1 requires interactive UI to stay clear
of system bars.
The platform reports the bar as a systemBars inset and Flutter forwards it
as MediaQuery.padding.left/right, but the mobile screens only honour the
top and bottom insets. On the emulator this only showed after the first
video session (the player's edge-to-edge restore stops the DecorView from
fitting a navigation-bar-typed left bar); on Android 14+ CarSystemUI the
left bar is a status-bar-typed inset, so it is under the bar from launch.
Car bars are opaque and may be impossible to hide, so nothing is worth
drawing under them: FormFactorScale now wraps the automotive surface in a
horizontal SafeArea inside the scaled MediaQuery, consuming the insets
once for every route.
Reproduced and verified on the API 33 automotive image with the
com.android.systemui.rro.left overlay enabled for the foreground user.
edde746
42b9bf7fb8