Prevent restoring split selection state for fallback overview

* Add flag to explicitly not restore
OVERVIEW_SPLIT_SELECT
* FallbackRecentsView then resets state in
RecentsView if our endState is ever not split selection

Fixes: 253178217
Test: Used launcher developer option to
force use separate recents activity. Tested w/
3 button nav + gesture.

Change-Id: I26c9994bf853e9a005300a02aa143991958fc461

quickstep/src/com/android/quickstep/fallback/FallbackRecentsView.java

@@ -243,6 +243,9 @@ public class FallbackRecentsView extends RecentsView<RecentsActivity, RecentsSta
         if (finalState != MODAL_TASK) {
             setOverviewSelectEnabled(false);
         }
+        if (finalState != OVERVIEW_SPLIT_SELECT) {
+            resetFromSplitSelectionState();
+        }
 
         if (isOverlayEnabled) {
             runActionOnRemoteHandles(remoteTargetHandle ->

quickstep/src/com/android/quickstep/fallback/RecentsState.java

@@ -55,7 +55,8 @@ public class RecentsState implements BaseState<RecentsState> {
     public static final RecentsState HOME = new RecentsState(3, 0);
     public static final RecentsState BG_LAUNCHER = new LauncherState(4, 0);
     public static final RecentsState OVERVIEW_SPLIT_SELECT = new RecentsState(5,
-            FLAG_SHOW_AS_GRID | FLAG_SCRIM | FLAG_OVERVIEW_UI | FLAG_CLOSE_POPUPS);
+            FLAG_SHOW_AS_GRID | FLAG_SCRIM | FLAG_OVERVIEW_UI | FLAG_CLOSE_POPUPS
+                    | FLAG_DISABLE_RESTORE);
 
     public final int ordinal;
     private final int mFlags;