Merge "Only show Desktop Wallpaper for the default display." into main
diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/desktopmode/DesktopTasksController.kt b/libs/WindowManager/Shell/src/com/android/wm/shell/desktopmode/DesktopTasksController.kt
index b9bb38c..dc3e2d0 100644
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/desktopmode/DesktopTasksController.kt
+++ b/libs/WindowManager/Shell/src/com/android/wm/shell/desktopmode/DesktopTasksController.kt
@@ -764,12 +764,15 @@
             newTaskIdInFront ?: "null"
         )
 
-        if (Flags.enableDesktopWindowingWallpaperActivity()) {
-            // Add translucent wallpaper activity to show the wallpaper underneath
-            addWallpaperActivity(wct)
-        } else {
-            // Move home to front
-            moveHomeTask(wct, toTop = true)
+        // Currently, we only handle the desktop on the default display really.
+        if (displayId == DEFAULT_DISPLAY) {
+            if (Flags.enableDesktopWindowingWallpaperActivity()) {
+                // Add translucent wallpaper activity to show the wallpaper underneath
+                addWallpaperActivity(wct)
+            } else {
+                // Move home to front
+                moveHomeTask(wct, toTop = true)
+            }
         }
 
         val nonMinimizedTasksOrderedFrontToBack =
diff --git a/libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/desktopmode/DesktopTasksControllerTest.kt b/libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/desktopmode/DesktopTasksControllerTest.kt
index 6cabbf9..4d1b6ba 100644
--- a/libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/desktopmode/DesktopTasksControllerTest.kt
+++ b/libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/desktopmode/DesktopTasksControllerTest.kt
@@ -311,6 +311,23 @@
   }
 
   @Test
+  @EnableFlags(Flags.FLAG_ENABLE_DESKTOP_WINDOWING_WALLPAPER_ACTIVITY)
+  fun showDesktopApps_onSecondaryDisplay_desktopWallpaperEnabled_shouldNotShowWallpaper() {
+    val task1 = setUpFreeformTask(SECOND_DISPLAY)
+    val task2 = setUpFreeformTask(SECOND_DISPLAY)
+    markTaskHidden(task1)
+    markTaskHidden(task2)
+
+    controller.showDesktopApps(SECOND_DISPLAY, RemoteTransition(TestRemoteTransition()))
+
+    val wct = getLatestWct(type = TRANSIT_TO_FRONT, handlerClass = OneShotRemoteHandler::class.java)
+    assertThat(wct.hierarchyOps).hasSize(2)
+    // Expect order to be from bottom: task1, task2 (no wallpaper intent)
+    wct.assertReorderAt(index = 0, task1)
+    wct.assertReorderAt(index = 1, task2)
+  }
+
+  @Test
   @DisableFlags(Flags.FLAG_ENABLE_DESKTOP_WINDOWING_WALLPAPER_ACTIVITY)
   fun showDesktopApps_appsAlreadyVisible_bringsToFront_desktopWallpaperDisabled() {
     val homeTask = setUpHomeTask()
@@ -330,6 +347,22 @@
   }
 
   @Test
+  @DisableFlags(Flags.FLAG_ENABLE_DESKTOP_WINDOWING_WALLPAPER_ACTIVITY)
+  fun showDesktopApps_onSecondaryDisplay_desktopWallpaperDisabled_shouldNotMoveLauncher() {
+    val task1 = setUpFreeformTask(SECOND_DISPLAY)
+    val task2 = setUpFreeformTask(SECOND_DISPLAY)
+    markTaskHidden(task1)
+    markTaskHidden(task2)
+
+    controller.showDesktopApps(SECOND_DISPLAY, RemoteTransition(TestRemoteTransition()))
+
+    val wct = getLatestWct(type = TRANSIT_TO_FRONT, handlerClass = OneShotRemoteHandler::class.java)
+    assertThat(wct.hierarchyOps).hasSize(2)
+    wct.assertReorderAt(index = 0, task1)
+    wct.assertReorderAt(index = 1, task2)
+  }
+
+  @Test
   @EnableFlags(Flags.FLAG_ENABLE_DESKTOP_WINDOWING_WALLPAPER_ACTIVITY)
   fun showDesktopApps_appsAlreadyVisible_bringsToFront_desktopWallpaperEnabled() {
     val task1 = setUpFreeformTask()