Use WindowManagerProxy.getRotation to determine if rotation has changed

- Follow-up of http://ag/19559863 as Config diff on windowConfiguration does not work on 3P Launcher, so diff WindowManagerProxy.getRotation instead
- Also centralized Configuration diff logic into StatefulActivity

Bug: 240730723
Test: manual on 90/180 degree rotation in Launcher, RecentsActivity and 3P Launcher
Change-Id: Ib368ed5d749841a6873a03e2644608ff68885922

quickstep/src/com/android/launcher3/BaseQuickstepLauncher.java

@@ -15,9 +15,6 @@
  */
 package com.android.launcher3;
 
-import static android.app.WindowConfiguration.WINDOW_CONFIG_ROTATION;
-import static android.content.pm.ActivityInfo.CONFIG_WINDOW_CONFIGURATION;
-
 import static com.android.launcher3.AbstractFloatingView.TYPE_ALL;
 import static com.android.launcher3.AbstractFloatingView.TYPE_HIDE_BACK_BUTTON;
 import static com.android.launcher3.LauncherState.FLAG_HIDE_BACK_BUTTON;
@@ -46,7 +43,6 @@ import android.app.ActivityOptions;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentSender;
-import android.content.res.Configuration;
 import android.hardware.SensorManager;
 import android.hardware.devicestate.DeviceStateManager;
 import android.os.Bundle;
@@ -653,20 +649,6 @@ public abstract class BaseQuickstepLauncher extends Launcher {
         }
     }
 
-    @Override
-    protected boolean compareConfiguration(Configuration oldConfig, Configuration newConfig) {
-        int diff = newConfig.diff(oldConfig);
-        if ((diff & CONFIG_WINDOW_CONFIGURATION) != 0) {
-            long windowDiff =
-                    newConfig.windowConfiguration.diff(oldConfig.windowConfiguration, false);
-            if ((windowDiff & WINDOW_CONFIG_ROTATION) != 0) {
-                return true;
-            }
-        }
-
-        return super.compareConfiguration(oldConfig, newConfig);
-    }
-
     @Override
     public void dump(String prefix, FileDescriptor fd, PrintWriter writer, String[] args) {
         super.dump(prefix, fd, writer, args);