Ensure recents scrolled to first task in landscape

The app should animate to the bottom view which means we should ensure
the bottom view is scrolled to be visible at the bottom when we animate
in. Note that this is only a consideration in landscape since in
portrait, all tasks are always visible and the recyclver view is not
scrollable.

Bug: 114136250
Test: Go to recents Go from app in landscape mode
Change-Id: If4ea35759cc881f2c32565368d031620b62a45dd

go/quickstep/src/com/android/quickstep/views/IconRecentsView.java

@@ -15,6 +15,8 @@
  */
 package com.android.quickstep.views;
 
+import static android.content.res.Configuration.ORIENTATION_LANDSCAPE;
+
 import static androidx.recyclerview.widget.LinearLayoutManager.VERTICAL;
 
 import static com.android.quickstep.TaskAdapter.CHANGE_EVENT_TYPE_EMPTY_TO_CONTENT;
@@ -99,6 +101,7 @@ public final class IconRecentsView extends FrameLayout {
     private final Context mContext;
     private final TaskListLoader mTaskLoader;
     private final TaskAdapter mTaskAdapter;
+    private final LinearLayoutManager mTaskLayoutManager;
     private final TaskActionController mTaskActionController;
     private final DefaultItemAnimator mDefaultItemAnimator = new DefaultItemAnimator();
     private final ContentFillItemAnimator mLoadingContentItemAnimator =
@@ -138,6 +141,7 @@ public final class IconRecentsView extends FrameLayout {
         mTaskAdapter.setOnClearAllClickListener(view -> animateClearAllTasks());
         mTaskActionController = new TaskActionController(mTaskLoader, mTaskAdapter);
         mTaskAdapter.setActionController(mTaskActionController);
+        mTaskLayoutManager = new LinearLayoutManager(mContext, VERTICAL, true /* reverseLayout */);
         RecentsModel.INSTANCE.get(context).addThumbnailChangeListener(listener);
     }
 
@@ -147,8 +151,7 @@ public final class IconRecentsView extends FrameLayout {
         if (mTaskRecyclerView == null) {
             mTaskRecyclerView = findViewById(R.id.recent_task_recycler_view);
             mTaskRecyclerView.setAdapter(mTaskAdapter);
-            mTaskRecyclerView.setLayoutManager(
-                    new LinearLayoutManager(mContext, VERTICAL, true /* reverseLayout */));
+            mTaskRecyclerView.setLayoutManager(mTaskLayoutManager);
             ItemTouchHelper helper = new ItemTouchHelper(
                     new TaskSwipeCallback(mTaskActionController));
             helper.attachToRecyclerView(mTaskRecyclerView);
@@ -211,6 +214,12 @@ public final class IconRecentsView extends FrameLayout {
      * becomes visible.
      */
     public void onBeginTransitionToOverview() {
+        if (mContext.getResources().getConfiguration().orientation == ORIENTATION_LANDSCAPE) {
+            // Scroll to bottom of task in landscape mode. This is a non-issue in portrait mode as
+            // all tasks should be visible to fill up the screen in portrait mode and the view will
+            // not be scrollable.
+            mTaskLayoutManager.scrollToPositionWithOffset(TASKS_START_POSITION, 0 /* offset */);
+        }
         scheduleFadeInLayoutAnimation();
         // Load any task changes
         if (!mTaskLoader.needsToLoad()) {