[flexiglass] Fix the scroll offset in Single Shade

    // set the bounds to null when the scrim disappears

    DisposableEffect(Unit) { onDispose { viewModel.onScrimBoundsChanged(null) } }

    val minScrimTop = with(density) { ShadeHeader.Dimensions.CollapsedHeight.toPx() }

    // Top position if the scrim, when it is fully expanded.

    val minScrimTop = ShadeHeader.Dimensions.CollapsedHeight

    // The minimum offset for the scrim. The scrim is considered fully expanded when it

    // is at this offset.

    val minScrimOffset: () -> Float = { minScrimTop - maxScrimTop() }

    val minScrimOffset: () -> Float = { with(density) { minScrimTop.toPx() } - maxScrimTop() }

    // The height of the scrim visible on screen when it is in its resting (collapsed) state.

    val minVisibleScrimHeight: () -> Float = {

                    }

                    .thenIf(shouldShowScrim) { Modifier.background(scrimBackgroundColor) }

                    .thenIf(shouldFillMaxSize) { Modifier.fillMaxSize() }

                    .thenIf(supportNestedScrolling) { Modifier.padding(bottom = minScrimTop) }

                    .debugBackground(viewModel, DEBUG_BOX_COLOR)

        ) {

            Column(

                modifier = modifier,

                shadeSession = shadeSession,

            )

        is ShadeMode.Dual -> error("Dual shade is not yet implemented!")

        is ShadeMode.Dual -> error("Dual shade is implemented separately as an overlay.")

    }

}