platformViewBackdrop property
When true, this glass renders via the live BackdropFilter path (the
lightweight render) EVEN at GlassQuality.premium — because the premium
shader samples a toImageSync texture, which cannot capture an iOS
PlatformView (map, video). Set this on glass directly over a PlatformView
so the live view shows through instead of a solid slab. Refraction is lost
(no texture), but rim/lighting and the live blur remain. Premium children
that refract Flutter content (e.g. the indicator) should NOT set this.
Implementation
final bool platformViewBackdrop;