Add brightness mirror support to dual shade

package com.android.systemui.qs.ui.composable

import androidx.compose.animation.AnimatedContent

import androidx.compose.animation.core.animateFloatAsState

import androidx.compose.animation.core.tween

import androidx.compose.animation.fadeIn

import androidx.compose.animation.fadeOut

import androidx.compose.runtime.getValue

import androidx.compose.ui.Alignment

import androidx.compose.ui.Modifier

import androidx.compose.ui.graphics.Color

import androidx.compose.ui.graphics.graphicsLayer

import androidx.compose.ui.layout.boundsInWindow

import androidx.compose.ui.layout.layoutId

import androidx.compose.ui.layout.onPlaced

            }

        val quickSettingsContainerViewModel =

            rememberViewModel("QuickSettingsShadeOverlayContainer") {

                // TODO(b/393054014): Add support for brightness mirroring.

                quickSettingsContainerViewModelFactory.create(supportsBrightnessMirroring = false)

                quickSettingsContainerViewModelFactory.create(supportsBrightnessMirroring = true)

            }

        val panelCornerRadius =

            with(LocalDensity.current) { OverlayShade.Dimensions.PanelCornerRadius.toPx().toInt() }

        val showBrightnessMirror =

            quickSettingsContainerViewModel.brightnessSliderViewModel.showMirror

        val contentAlphaFromBrightnessMirror by

            animateFloatAsState(if (showBrightnessMirror) 0f else 1f)

        // Set the bounds to null when the QuickSettings overlay disappears.

        DisposableEffect(Unit) { onDispose { contentViewModel.onPanelShapeChanged(null) } }

        Box(modifier = modifier) {

        Box(modifier = modifier.graphicsLayer { alpha = contentAlphaFromBrightnessMirror }) {

            SnoozeableHeadsUpNotificationSpace(

                stackScrollView = notificationStackScrollView.get(),

                viewModel =

        ) {

            BrightnessSliderContainer(

                viewModel = viewModel.brightnessSliderViewModel,

                containerColor = Color.Transparent,

                containerColor = OverlayShade.Colors.PanelBackground,

                modifier =

                    Modifier.fillMaxWidth()

                        .height(QuickSettingsShade.Dimensions.BrightnessSliderHeight),