[bc25] Support both horizontal and vertical alignment in dual shade.

This is necessary to allow dual shade to be invoked from the bottom on
other system UI variants, such as ARC.

Test: Manually tested by opening and closing the quick settings shade on
a foldable device both in a folded and unfolded configuration.
Test: Unit tests build and pass.
Bug: 343744476
Flag: com.android.systemui.dual_shade

Change-Id: Idf48a30f317c2d318d3ba80d447abbb4f6377f99

packages/SystemUI/compose/features/src/com/android/systemui/notifications/ui/composable/NotificationsShadeScene.kt

@@ -16,11 +16,11 @@
 
 package com.android.systemui.notifications.ui.composable
 
-import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.padding
 import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.unit.dp
 import com.android.compose.animation.scene.SceneScope
@@ -75,7 +75,7 @@ constructor(
         OverlayShade(
             modifier = modifier,
             viewModel = overlayShadeViewModel,
-            horizontalArrangement = Arrangement.End,
+            panelAlignment = Alignment.TopEnd,
             lockscreenContent = lockscreenContent,
         ) {
             Column {

packages/SystemUI/compose/features/src/com/android/systemui/qs/ui/composable/QuickSettingsShadeScene.kt

@@ -82,7 +82,7 @@ constructor(
     ) {
         OverlayShade(
             viewModel = viewModel.overlayShadeViewModel,
-            horizontalArrangement = Arrangement.End,
+            panelAlignment = Alignment.TopEnd,
             lockscreenContent = lockscreenContent,
             modifier = modifier,
         ) {

packages/SystemUI/compose/features/src/com/android/systemui/shade/ui/composable/OverlayShade.kt

@@ -20,11 +20,9 @@ package com.android.systemui.shade.ui.composable
 
 import androidx.compose.foundation.background
 import androidx.compose.foundation.clickable
-import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.ExperimentalLayoutApi
 import androidx.compose.foundation.layout.PaddingValues
-import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.WindowInsets
 import androidx.compose.foundation.layout.asPaddingValues
@@ -43,6 +41,7 @@ import androidx.compose.material3.windowsizeclass.WindowWidthSizeClass
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.ReadOnlyComposable
 import androidx.compose.runtime.getValue
+import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.graphics.Color
@@ -64,7 +63,7 @@ import java.util.Optional
 @Composable
 fun SceneScope.OverlayShade(
     viewModel: OverlayShadeViewModel,
-    horizontalArrangement: Arrangement.Horizontal,
+    panelAlignment: Alignment,
     lockscreenContent: Lazy<Optional<LockscreenContent>>,
     modifier: Modifier = Modifier,
     content: @Composable () -> Unit,
@@ -81,9 +80,9 @@ fun SceneScope.OverlayShade(
 
         Scrim(onClicked = viewModel::onScrimClicked)
 
-        Row(
+        Box(
             modifier = Modifier.fillMaxSize().panelPadding(),
-            horizontalArrangement = horizontalArrangement,
+            contentAlignment = panelAlignment,
         ) {
             Panel(
                 modifier = Modifier.element(OverlayShade.Elements.Panel).panelSize(),