Fix dialog accessibility issues.

This CL fixes some accessibility issues that would happen with dialogs
launched by the DialogLaunchAnimator. See bugs for more info.

Bug: 204944038
Bug: 208951968
Bug: 208951526
Fixes: 204944038
Fixes: 208951968
Fixes: 208951526
Test: Manual
Change-Id: I35b12a6e2bb2c4ae8556178fb634deb963457db6

packages/SystemUI/animation/src/com/android/systemui/animation/DialogLaunchAnimator.kt

@@ -299,6 +299,13 @@ private class AnimatedDialog(
             fullscreenTransparentBackground.setOnClickListener { dialog.dismiss() }
             dialogContentWithBackground.isClickable = true
 
+            // Make sure the transparent and dialog backgrounds are not focusable by accessibility
+            // features.
+            fullscreenTransparentBackground.importantForAccessibility =
+                View.IMPORTANT_FOR_ACCESSIBILITY_NO
+            dialogContentWithBackground.importantForAccessibility =
+                View.IMPORTANT_FOR_ACCESSIBILITY_NO
+
             fullscreenTransparentBackground.addView(
                 dialogContentWithBackground,
                 FrameLayout.LayoutParams(
@@ -342,8 +349,10 @@ private class AnimatedDialog(
                 ?.color
                 ?.defaultColor ?: Color.BLACK
 
-        // Make the background view invisible until we start the animation.
-        dialogContentWithBackground.visibility = View.INVISIBLE
+        // Make the background view invisible until we start the animation. We use the transition
+        // visibility like GhostView does so that we don't mess up with the accessibility tree (see
+        // b/204944038#comment17).
+        dialogContentWithBackground.setTransitionVisibility(View.INVISIBLE)
 
         // Make sure the dialog is visible instantly and does not do any window animation.
         window.attributes.windowAnimations = R.style.Animation_LaunchAnimation

packages/SystemUI/animation/src/com/android/systemui/animation/GhostedViewLaunchAnimatorController.kt

@@ -186,7 +186,11 @@ open class GhostedViewLaunchAnimatorController(
                 // Making the ghost view invisible will make the ghosted view visible, so order is
                 // important here.
                 ghostView.visibility = View.INVISIBLE
-                ghostedView.visibility = View.INVISIBLE
+
+                // Make the ghosted view invisible again. We use the transition visibility like
+                // GhostView does so that we don't mess up with the accessibility tree (see
+                // b/204944038#comment17).
+                ghostedView.setTransitionVisibility(View.INVISIBLE)
                 backgroundView.visibility = View.INVISIBLE
             }
             return
@@ -257,6 +261,10 @@ open class GhostedViewLaunchAnimatorController(
 
         GhostView.removeGhost(ghostedView)
         launchContainerOverlay.remove(backgroundView)
+
+        // Make sure that the view is considered VISIBLE by accessibility by first making it
+        // INVISIBLE then VISIBLE (see b/204944038#comment17 for more info).
+        ghostedView.visibility = View.INVISIBLE
         ghostedView.visibility = View.VISIBLE
         ghostedView.invalidate()
     }