You correctly diagnosed the symptom: the AppBar gets taller when the
banner is present. Why: the shell is [Banner, Expanded(child),
PlayerBar] and the banner uses SafeArea(bottom:false) to clear the
status bar. But MediaQuery.padding is screen-relative — the child's
Scaffold/AppBar reads MediaQuery.padding.top and applies its own
status-bar inset on top of the banner, doubling the gap.
Watch shouldShowUpdateBannerProvider in the shell. When it returns
non-null (banner visible), wrap the child in MediaQuery.removePadding
removeTop: true so the AppBar mounts directly under the banner. When
the banner is hidden, child gets its normal top inset.
bvandeusen
a05a279508