Add OnComputeInsetsListener to TaskbarContainerView

Instead of updating visibility of TaskbarContainerView, keep it
VISIBLE but with alpha 0, and update touchableInsets to allow
touches to pass through. This avoids sending insets changed
when Taskbar is hidden.

Test: Swipe to Overview, no jumping/jank due to insets change;
also tap where Taskbar would be and ensure it doesn't launch

Bug: 171917176
Change-Id: I9ccb4335e0301f34eec459657f3bbaf88b0d8a52

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

@@ -38,7 +38,6 @@ import com.android.launcher3.BaseQuickstepLauncher;
 import com.android.launcher3.LauncherState;
 import com.android.launcher3.QuickstepAppTransitionManagerImpl;
 import com.android.launcher3.R;
-import com.android.launcher3.anim.AlphaUpdateListener;
 import com.android.launcher3.anim.PendingAnimation;
 import com.android.launcher3.model.data.ItemInfo;
 import com.android.launcher3.states.StateAnimationConfig;
@@ -107,7 +106,6 @@ public class TaskbarController {
             @Override
             public void updateTaskbarVisibilityAlpha(float alpha) {
                 mTaskbarContainerView.setAlpha(alpha);
-                AlphaUpdateListener.updateVisibility(mTaskbarContainerView);
             }
         };
     }
@@ -167,6 +165,7 @@ public class TaskbarController {
     public void init() {
         mTaskbarView.init(mHotseatController.getNumHotseatIcons(),
                 mRecentsController.getNumRecentIcons());
+        mTaskbarContainerView.init(mTaskbarView);
         addToWindowManager();
         mTaskbarStateHandler.setTaskbarCallbacks(createTaskbarStateHandlerCallbacks());
         mTaskbarVisibilityController.init();
@@ -188,6 +187,7 @@ public class TaskbarController {
      */
     public void cleanup() {
         mTaskbarView.cleanup();
+        mTaskbarContainerView.cleanup();
         removeFromWindowManager();
         mTaskbarStateHandler.setTaskbarCallbacks(null);
         mTaskbarVisibilityController.cleanup();