Fix missing clock on clock setting screen

clockHostView tries to add clockView before removeAllView has finished.
Post adding clockView to the next round.

Flag: EXEMPT bugfix
Fixes: 396984345
Test: preview clock
Change-Id: I6fd30ab82e30da52a6926a4484baca412808a039
diff --git a/src/com/android/customization/picker/clock/ui/binder/ClockSettingsBinder.kt b/src/com/android/customization/picker/clock/ui/binder/ClockSettingsBinder.kt
index 764c671..3d1e32f 100644
--- a/src/com/android/customization/picker/clock/ui/binder/ClockSettingsBinder.kt
+++ b/src/com/android/customization/picker/clock/ui/binder/ClockSettingsBinder.kt
@@ -207,10 +207,14 @@
                                     ClockSize.DYNAMIC -> clockViewFactory.getLargeView(clockId)
                                     ClockSize.SMALL -> clockViewFactory.getSmallView(clockId)
                                 }
-                            // The clock view might still be attached to an existing parent.
-                            // Detach before adding to another parent.
-                            (clockView.parent as? ViewGroup)?.removeView(clockView)
-                            clockHostView.addView(clockView)
+
+                            // Wait for previous removeAllViews to finish, and add the clockView
+                            clockHostView.post {
+                                // The clock view might still be attached to an existing parent.
+                                // Detach before adding to another parent.
+                                (clockView.parent as? ViewGroup)?.removeView(clockView)
+                                clockHostView.addView(clockView)
+                            }
 
                             when (size) {
                                 ClockSize.DYNAMIC -> {