Fade in/out taskbar when launching apps from or back to AllApps/-1

- Added isHotseatIconTopWhenAligned to control both iconAlignment and stash animation to just fade in if hotseat icon isn't on top of the screen in the aligned state

Fix: 257355864
Fix: 213455090
Test: Launch apps from/back to home, taskbar animate from/to hotseat
Test: Launch apps from/back to AllApps/-1, taskbar fade in/out
Test: Repeat aboth with transient or persistent taskbar
Change-Id: I6bdae615ff9e199d23cbfe2d26c8d46a08fbc436

quickstep/src/com/android/launcher3/QuickstepTransitionManager.java

@@ -482,6 +482,10 @@ public class QuickstepTransitionManager implements OnDeviceProfileChangeListener
             final View appsView = mLauncher.getAppsView();
             final float startAlpha = appsView.getAlpha();
             final float startScale = SCALE_PROPERTY.get(appsView);
+            if (mDeviceProfile.isTablet) {
+                // AllApps should not fade at all in tablets.
+                alphas = new float[]{1, 1};
+            }
             appsView.setAlpha(alphas[0]);
 
             ObjectAnimator alpha = ObjectAnimator.ofFloat(appsView, View.ALPHA, alphas);