Update listeners of stashed state after add

When a VisibleTasksListener is added to DesktopModeTaskRepository, send
an update with the current stashed value.
This is in addition to the update on visibility.

Launcher will start using the visibility listener for updating its
state. Remove the TODO for it.

Test: atest DesktopModeTaskRepositoryTest
Bug: 280490493
Change-Id: I9d6638a73283f5121599384b80ea84f671bb884b

libs/WindowManager/Shell/src/com/android/wm/shell/desktopmode/DesktopModeTaskRepository.kt

@@ -86,8 +86,10 @@ class DesktopModeTaskRepository {
         visibleTasksListeners[visibleTasksListener] = executor
         displayData.keyIterator().forEach { displayId ->
             val visibleTasks = getVisibleTaskCount(displayId)
+            val stashed = isStashed(displayId)
             executor.execute {
                 visibleTasksListener.onVisibilityChanged(displayId, visibleTasks > 0)
+                visibleTasksListener.onStashedChanged(displayId, stashed)
             }
         }
     }

libs/WindowManager/Shell/src/com/android/wm/shell/desktopmode/DesktopTasksController.kt

@@ -742,16 +742,21 @@ class DesktopTasksController(
 
         private val listener: VisibleTasksListener = object : VisibleTasksListener {
             override fun onVisibilityChanged(displayId: Int, visible: Boolean) {
-                // TODO(b/261234402): move visibility from sysui state to listener
+                KtProtoLog.v(
+                        WM_SHELL_DESKTOP_MODE,
+                        "IDesktopModeImpl: onVisibilityChanged display=%d visible=%b",
+                        displayId,
+                        visible
+                )
                 remoteListener.call { l -> l.onVisibilityChanged(displayId, visible) }
             }
 
             override fun onStashedChanged(displayId: Int, stashed: Boolean) {
                 KtProtoLog.v(
                         WM_SHELL_DESKTOP_MODE,
-                        "IDesktopModeImpl: onStashedChanged stashed=%b display=%d",
-                        stashed,
-                        displayId
+                        "IDesktopModeImpl: onStashedChanged display=%d stashed=%b",
+                        displayId,
+                        stashed
                 )
                 remoteListener.call { l -> l.onStashedChanged(displayId, stashed) }
             }

libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/desktopmode/DesktopModeTaskRepositoryTest.kt

@@ -128,6 +128,18 @@ class DesktopModeTaskRepositoryTest : ShellTestCase() {
         assertThat(listener.visibleChangesOnDefaultDisplay).isEqualTo(1)
     }
 
+    @Test
+    fun addListener_notifiesStashed() {
+        repo.setStashed(DEFAULT_DISPLAY, true)
+        val listener = TestVisibilityListener()
+        val executor = TestShellExecutor()
+        repo.addVisibleTasksListener(listener, executor)
+        executor.flushAll()
+
+        assertThat(listener.stashedOnDefaultDisplay).isTrue()
+        assertThat(listener.stashedChangesOnDefaultDisplay).isEqualTo(1)
+    }
+
     @Test
     fun addListener_tasksOnDifferentDisplay_doesNotNotify() {
         repo.updateVisibleFreeformTasks(SECOND_DISPLAY, taskId = 1, visible = true)