Fixing fallback recents not getting proper insets on configuration change

> Using common code for Launcher and recents for insets dispatching
> Fixing recents auto closing when there is no running task

Bug: 158750568
Bug: 159133601
Change-Id: Iee25c603a77a1ac546ada1840f3afaf5797b8802
diff --git a/src/com/android/launcher3/Launcher.java b/src/com/android/launcher3/Launcher.java
index ec32e62..7fc64ea 100644
--- a/src/com/android/launcher3/Launcher.java
+++ b/src/com/android/launcher3/Launcher.java
@@ -260,7 +260,6 @@
 
     @Thunk
     Workspace mWorkspace;
-    private View mLauncherView;
     @Thunk
     DragLayer mDragLayer;
     private DragController mDragController;
@@ -363,6 +362,7 @@
         LauncherAppState app = LauncherAppState.getInstance(this);
         mOldConfig = new Configuration(getResources().getConfiguration());
         mModel = app.getModel();
+
         mRotationHelper = new RotationHelper(this);
         InvariantDeviceProfile idp = app.getInvariantDeviceProfile();
         initDeviceProfile(idp);
@@ -382,8 +382,7 @@
                 appWidgetId -> getWorkspace().removeWidget(appWidgetId));
         mAppWidgetHost.startListening();
 
-        mLauncherView = LayoutInflater.from(this).inflate(R.layout.launcher, null);
-
+        inflateRootView(R.layout.launcher);
         setupViews();
         mPopupDataProvider = new PopupDataProvider(this::updateNotificationDots);
 
@@ -420,7 +419,7 @@
         // For handling default keys
         setDefaultKeyMode(DEFAULT_KEYS_SEARCH_LOCAL);
 
-        setContentView(mLauncherView);
+        setContentView(getRootView());
         getRootView().dispatchInsets();
 
         // Listen for broadcasts
@@ -520,12 +519,6 @@
     }
 
     @Override
-    public void reapplyUi(boolean cancelCurrentAnimation) {
-        getRootView().dispatchInsets();
-        super.reapplyUi(cancelCurrentAnimation);
-    }
-
-    @Override
     public void onIdpChanged(int changeFlags, InvariantDeviceProfile idp) {
         onIdpChanged(idp);
     }
@@ -581,11 +574,6 @@
         return mStateManager;
     }
 
-    @Override
-    public <T extends View> T findViewById(int id) {
-        return mLauncherView.findViewById(id);
-    }
-
     private LauncherCallbacks mLauncherCallbacks;
 
     /**
@@ -1118,10 +1106,6 @@
         mHotseat = findViewById(R.id.hotseat);
         mHotseat.setWorkspace(mWorkspace);
 
-        mLauncherView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
-                | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
-                | View.SYSTEM_UI_FLAG_LAYOUT_STABLE);
-
         // Setup the drag layer
         mDragLayer.setup(mDragController, mWorkspace);
 
@@ -1335,11 +1319,6 @@
     }
 
     @Override
-    public LauncherRootView getRootView() {
-        return (LauncherRootView) mLauncherView;
-    }
-
-    @Override
     public DragLayer getDragLayer() {
         return mDragLayer;
     }