Update alpha animation for All Apps / Divider icon.

This prevents the icons from lingering as the spring settles for the scaling reveal
home animation.

Bug: 298089923
Test: go from app to home, from overview to home, vice versa
Flag: ACONFIG com.android.launcher3.enable_scaling_reveal_home_animation DISABLED
Change-Id: I6bc3f0fcbdc63f0c064d425c8ebaf62a20451ac1

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

@@ -17,6 +17,7 @@ package com.android.launcher3.taskbar;
 
 import static com.android.app.animation.Interpolators.FINAL_FRAME;
 import static com.android.app.animation.Interpolators.LINEAR;
+import static com.android.launcher3.Flags.enableScalingRevealHomeAnimation;
 import static com.android.launcher3.LauncherAnimUtils.SCALE_PROPERTY;
 import static com.android.launcher3.LauncherAnimUtils.VIEW_ALPHA;
 import static com.android.launcher3.LauncherAnimUtils.VIEW_TRANSLATE_X;
@@ -679,6 +680,12 @@ public class TaskbarViewController implements TaskbarControllers.LoggableTaskbar
                         && mIsStashed) {
                     // Prevent All Apps icon from appearing when going from hotseat to nav handle.
                     setter.setViewAlpha(child, 0, Interpolators.clampToProgress(LINEAR, 0f, 0f));
+                } else if (enableScalingRevealHomeAnimation()) {
+                    // Tighten clamp so that these icons do not linger as the spring settles.
+                    setter.setViewAlpha(child, 0,
+                            isToHome
+                                    ? Interpolators.clampToProgress(LINEAR, 0f, 0.07f)
+                                    : Interpolators.clampToProgress(LINEAR, 0.93f, 1f));
                 } else {
                     setter.setViewAlpha(child, 0,
                             isToHome