packages/SystemUI/res/layout/alert_dialog_button_bar_systemui.xml

<?xml version="1.0" encoding="utf-8"?>

<!--
  ~ Copyright (C) 2021 The Android Open Source Project
  ~
  ~ Licensed under the Apache License, Version 2.0 (the "License");
  ~ you may not use this file except in compliance with the License.
  ~ You may obtain a copy of the License at
  ~
  ~      http://www.apache.org/licenses/LICENSE-2.0
  ~
  ~ Unless required by applicable law or agreed to in writing, software
  ~ distributed under the License is distributed on an "AS IS" BASIS,
  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  ~ See the License for the specific language governing permissions and
  ~ limitations under the License.
  -->
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@*android:id/buttonPanel"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:scrollbarAlwaysDrawVerticalTrack="true"
    android:scrollIndicators="top|bottom"
    android:fillViewport="true"
    android:paddingTop="@dimen/dialog_button_bar_top_padding"
    android:paddingStart="@dimen/dialog_side_padding"
    android:paddingEnd="@dimen/dialog_side_padding"
    android:paddingBottom="@dimen/dialog_bottom_padding"
    style="?android:attr/buttonBarStyle">
    <com.android.internal.widget.ButtonBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layoutDirection="locale"
        android:orientation="horizontal"
        android:gravity="bottom">

        <Button
            android:id="@android:id/button3"
            style="?android:attr/buttonBarNeutralButtonStyle"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />

        <Space
            android:id="@*android:id/spacer"
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:layout_weight="1"
            android:visibility="invisible" />

        <Button
            android:id="@android:id/button2"
            style="?android:attr/buttonBarNegativeButtonStyle"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />

        <Button
            android:id="@android:id/button1"
            style="?android:attr/buttonBarPositiveButtonStyle"
            android:layout_marginStart="8dp"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
    </com.android.internal.widget.ButtonBarLayout>
</ScrollView>