Merge "Fix some small related to back button alpha" into sc-v2-dev am: 75867ae0ba am: 747dae3bb2

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/16487030

Change-Id: I1392f9f16613ef9fb0add480260d9d5af3fbed16

quickstep/src/com/android/launcher3/taskbar/TaskbarActivityContext.java

@@ -429,6 +429,9 @@ public class TaskbarActivityContext extends ContextThemeWrapper implements Activ
     }
 
     public void onNavButtonsDarkIntensityChanged(float darkIntensity) {
+        if (!isUserSetupComplete()) {
+            return;
+        }
         mControllers.navbarButtonsViewController.getTaskbarNavButtonDarkIntensity()
                 .updateValue(darkIntensity);
     }