Merge changes Ieb3493f2,Iff1926d2 into udc-qpr-dev

* changes:
  Only notify listeners when group expansion changes.
  Add flag for group expansion listener changes.

packages/SystemUI/src/com/android/systemui/flags/Flags.kt

@@ -112,6 +112,12 @@ object Flags {
             default = true
         )
 
+    /** Only notify group expansion listeners when a change happens. */
+    // TODO(b/292213543): Tracking Bug
+    @JvmField
+    val NOTIFICATION_GROUP_EXPANSION_CHANGE =
+            unreleasedFlag(292213543, "notification_group_expansion_change", teamfood = false)
+
     // 200 - keyguard/lockscreen
     // ** Flag retired **
     // public static final BooleanFlag KEYGUARD_LAYOUT =

packages/SystemUI/src/com/android/systemui/statusbar/notification/collection/render/GroupExpansionManagerImpl.java

@@ -21,6 +21,8 @@ import androidx.annotation.NonNull;
 import com.android.systemui.Dumpable;
 import com.android.systemui.dagger.SysUISingleton;
 import com.android.systemui.dump.DumpManager;
+import com.android.systemui.flags.FeatureFlags;
+import com.android.systemui.flags.Flags;
 import com.android.systemui.statusbar.notification.collection.GroupEntry;
 import com.android.systemui.statusbar.notification.collection.ListEntry;
 import com.android.systemui.statusbar.notification.collection.NotifPipeline;
@@ -44,14 +46,21 @@ public class GroupExpansionManagerImpl implements GroupExpansionManager, Dumpabl
     private final GroupMembershipManager mGroupMembershipManager;
     private final Set<OnGroupExpansionChangeListener> mOnGroupChangeListeners = new HashSet<>();
 
-    // Set of summary keys whose groups are expanded
+    /**
+     * Set of summary keys whose groups are expanded.
+     * NOTE: This should not be modified without notifying listeners, so prefer using
+     * {@code setGroupExpanded} when making changes.
+      */
     private final Set<NotificationEntry> mExpandedGroups = new HashSet<>();
 
+    private final FeatureFlags mFeatureFlags;
+
     @Inject
     public GroupExpansionManagerImpl(DumpManager dumpManager,
-            GroupMembershipManager groupMembershipManager) {
+            GroupMembershipManager groupMembershipManager, FeatureFlags featureFlags) {
         mDumpManager = dumpManager;
         mGroupMembershipManager = groupMembershipManager;
+        mFeatureFlags = featureFlags;
     }
 
     /**
@@ -85,14 +94,18 @@ public class GroupExpansionManagerImpl implements GroupExpansionManager, Dumpabl
     @Override
     public void setGroupExpanded(NotificationEntry entry, boolean expanded) {
         final NotificationEntry groupSummary = mGroupMembershipManager.getGroupSummary(entry);
+        boolean changed;
         if (expanded) {
-            mExpandedGroups.add(groupSummary);
+            changed = mExpandedGroups.add(groupSummary);
         } else {
-            mExpandedGroups.remove(groupSummary);
+            changed = mExpandedGroups.remove(groupSummary);
         }
 
+        // Only notify listeners if something changed.
+        if (!mFeatureFlags.isEnabled(Flags.NOTIFICATION_GROUP_EXPANSION_CHANGE) || changed) {
             sendOnGroupExpandedChange(entry, expanded);
         }
+    }
 
     @Override
     public boolean toggleGroupExpansion(NotificationEntry entry) {

packages/SystemUI/tests/src/com/android/systemui/statusbar/notification/collection/render/GroupExpansionManagerTest.kt

@@ -0,0 +1,87 @@
+/*
+ * Copyright (C) 2023 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.
+ */
+
+package com.android.systemui.statusbar.notification.collection.render
+
+import androidx.test.filters.SmallTest
+import com.android.systemui.SysuiTestCase
+import com.android.systemui.dump.DumpManager
+import com.android.systemui.flags.FakeFeatureFlags
+import com.android.systemui.flags.Flags
+import com.android.systemui.statusbar.notification.collection.NotificationEntryBuilder
+import com.android.systemui.util.mockito.mock
+import org.junit.Assert
+import org.junit.Before
+import org.junit.Test
+import org.mockito.Mockito.`when` as whenever
+
+@SmallTest
+class GroupExpansionManagerTest : SysuiTestCase() {
+    private lateinit var gem: GroupExpansionManagerImpl
+
+    private val dumpManager: DumpManager = mock()
+    private val groupMembershipManager: GroupMembershipManager = mock()
+    private val featureFlags = FakeFeatureFlags()
+
+    private val entry1 = NotificationEntryBuilder().build()
+    private val entry2 = NotificationEntryBuilder().build()
+
+    @Before
+    fun setUp() {
+        whenever(groupMembershipManager.getGroupSummary(entry1)).thenReturn(entry1)
+        whenever(groupMembershipManager.getGroupSummary(entry2)).thenReturn(entry2)
+
+        gem = GroupExpansionManagerImpl(dumpManager, groupMembershipManager, featureFlags)
+    }
+
+    @Test
+    fun testNotifyOnlyOnChange_enabled() {
+        featureFlags.set(Flags.NOTIFICATION_GROUP_EXPANSION_CHANGE, true)
+
+        var listenerCalledCount = 0
+        gem.registerGroupExpansionChangeListener { _, _ -> listenerCalledCount++ }
+
+        gem.setGroupExpanded(entry1, false)
+        Assert.assertEquals(0, listenerCalledCount)
+        gem.setGroupExpanded(entry1, true)
+        Assert.assertEquals(1, listenerCalledCount)
+        gem.setGroupExpanded(entry2, true)
+        Assert.assertEquals(2, listenerCalledCount)
+        gem.setGroupExpanded(entry1, true)
+        Assert.assertEquals(2, listenerCalledCount)
+        gem.setGroupExpanded(entry2, false)
+        Assert.assertEquals(3, listenerCalledCount)
+    }
+
+    @Test
+    fun testNotifyOnlyOnChange_disabled() {
+        featureFlags.set(Flags.NOTIFICATION_GROUP_EXPANSION_CHANGE, false)
+
+        var listenerCalledCount = 0
+        gem.registerGroupExpansionChangeListener { _, _ -> listenerCalledCount++ }
+
+        gem.setGroupExpanded(entry1, false)
+        Assert.assertEquals(1, listenerCalledCount)
+        gem.setGroupExpanded(entry1, true)
+        Assert.assertEquals(2, listenerCalledCount)
+        gem.setGroupExpanded(entry2, true)
+        Assert.assertEquals(3, listenerCalledCount)
+        gem.setGroupExpanded(entry1, true)
+        Assert.assertEquals(4, listenerCalledCount)
+        gem.setGroupExpanded(entry2, false)
+        Assert.assertEquals(5, listenerCalledCount)
+    }
+}