Fix TalkBack page announcments in RecentsView

Because a PagedView has page a11y actions (PAGE_LEFT/RIGHT),
a11y services now identify recents apps as a pager.
Tweak the a11y event info to accomodate this so the announcements
are correct.
Also fix the CollectionItemInfo to have the correct page index.

Bug: 141899192
Test: Tested with TalkBack on device
Change-Id: Ic578bee8de26a41f0ab0e5468f1fd060ed21a7e1

quickstep/recents_ui_overrides/src/com/android/quickstep/views/RecentsView.java

@@ -1673,8 +1673,8 @@ public abstract class RecentsView<T extends BaseActivity> extends PagedView impl
 
         if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_SCROLLED) {
             final int[] visibleTasks = getVisibleChildrenRange();
-            event.setFromIndex(taskViewCount - visibleTasks[1] - 1);
-            event.setToIndex(taskViewCount - visibleTasks[0] - 1);
+            event.setFromIndex(taskViewCount - visibleTasks[1]);
+            event.setToIndex(taskViewCount - visibleTasks[0]);
             event.setItemCount(taskViewCount);
         }
     }

quickstep/recents_ui_overrides/src/com/android/quickstep/views/TaskView.java

@@ -728,8 +728,8 @@ public class TaskView extends FrameLayout implements PageCallbacks, Reusable {
         final RecentsView recentsView = getRecentsView();
         final AccessibilityNodeInfo.CollectionItemInfo itemInfo =
                 AccessibilityNodeInfo.CollectionItemInfo.obtain(
-                        0, 1, recentsView.getChildCount() - recentsView.indexOfChild(this) - 1, 1,
-                        false);
+                        0, 1, recentsView.getTaskViewCount() - recentsView.indexOfChild(this) - 1,
+                        1, false);
         info.setCollectionItemInfo(itemInfo);
     }