Invalidate talkback accessibility tree after transitioning

Using AutoTransition seems to allow the talkback accessibility nodes to
stay out of sync if the user starts iterating the view during the
transition. Calling `notifySubtreeAccessibilityStateChangedIfNeeded()`
on the end of the transition gets us back into the correct state.

Test: manual; start iterating view via talkback swiping while the
channel dialog editor transitions between app notifications on/off
Fixes: 133822221

Change-Id: I7218bc0734cf05372b8fbecfb6eeef69cb3f1d40

packages/SystemUI/src/com/android/systemui/statusbar/notification/row/ChannelEditorListView.kt

@@ -24,6 +24,7 @@ import android.content.Context
 import android.graphics.drawable.Drawable
 import android.text.TextUtils
 import android.transition.AutoTransition
+import android.transition.Transition
 import android.transition.TransitionManager
 import android.util.AttributeSet
 import android.view.LayoutInflater
@@ -62,6 +63,23 @@ class ChannelEditorListView(c: Context, attrs: AttributeSet) : LinearLayout(c, a
 
         val transition = AutoTransition()
         transition.duration = 200
+        transition.addListener(object : Transition.TransitionListener {
+            override fun onTransitionEnd(p0: Transition?) {
+                notifySubtreeAccessibilityStateChangedIfNeeded()
+            }
+
+            override fun onTransitionResume(p0: Transition?) {
+            }
+
+            override fun onTransitionPause(p0: Transition?) {
+            }
+
+            override fun onTransitionCancel(p0: Transition?) {
+            }
+
+            override fun onTransitionStart(p0: Transition?) {
+            }
+        })
         TransitionManager.beginDelayedTransition(this, transition)
 
         // Remove any rows