DO NO MERGE -- Revert the following two commits as they're causing flickering

When double tapping Recents, need to reinvestigate.

b/30831873
b/30790402

Revert "Clear WS.mDestroying on AWT.clearAnimatingFlags"

This reverts commit c2661e52eae3161ac8c02e831290ad50ad395be2.

Revert "Some fixes for transition animation selection"

This reverts commit 73e9bc3f1557f0320c8af843dfb051f27187361d.

services/core/java/com/android/server/wm/AppWindowToken.java

@@ -17,9 +17,7 @@
 package com.android.server.wm;
 
 import static android.app.ActivityManager.StackId;
-import static android.view.WindowManager.LayoutParams.FLAG_SHOW_WALLPAPER;
 import static android.view.WindowManager.LayoutParams.TYPE_APPLICATION_STARTING;
-import static android.view.WindowManagerPolicy.FINISH_LAYOUT_REDO_WALLPAPER;
 import static com.android.server.wm.WindowManagerDebugConfig.DEBUG_ANIM;
 import static com.android.server.wm.WindowManagerDebugConfig.DEBUG_APP_TRANSITIONS;
 import static com.android.server.wm.WindowManagerDebugConfig.DEBUG_ADD_REMOVE;
@@ -359,14 +357,8 @@ class AppWindowToken extends WindowToken {
                 // placement for this window during this period, one or more frame will
                 // show up with wrong position or scale.
                 win.mWinAnimator.mAnimating = false;
-
-                if (win.mDestroying) {
-                    win.mDestroying = false;
-                    service.mDestroySurface.remove(win);
-                }
             }
         }
-        requestUpdateWallpaperIfNeeded();
     }
 
     void destroySurfaces() {
@@ -414,9 +406,6 @@ class AppWindowToken extends WindowToken {
             if (displayContent != null && !displayList.contains(displayContent)) {
                 displayList.add(displayContent);
             }
-            if (cleanupOnResume) {
-                win.requestUpdateWallpaperIfNeeded();
-            }
             win.mDestroying = false;
         }
         for (int i = 0; i < displayList.size(); i++) {

services/core/java/com/android/server/wm/WallpaperController.java

@@ -590,9 +590,18 @@ class WallpaperController {
                                 "Animating wallpapers: old#" + oldI + "=" + oldW + "; new#"
                                 + wallpaperTargetIndex + "=" + wallpaperTarget);
 
-                        // Set the upper and lower wallpaper targets correctly,
+                        // Set the new target correctly.
+                        if (wallpaperTarget.mAppToken != null
+                                && wallpaperTarget.mAppToken.hiddenRequested) {
+                            if (DEBUG_WALLPAPER_LIGHT) Slog.v(TAG,
+                                    "Old wallpaper still the target.");
+                            mWallpaperTarget = oldW;
+                            wallpaperTarget = oldW;
+                            wallpaperTargetIndex = oldI;
+                        }
+                        // Now set the upper and lower wallpaper targets correctly,
                         // and make sure that we are positioning the wallpaper below the lower.
-                        if (wallpaperTargetIndex > oldI) {
+                        else if (wallpaperTargetIndex > oldI) {
                             // The new target is on top of the old one.
                             if (DEBUG_WALLPAPER_LIGHT) Slog.v(TAG,
                                     "Found target above old target.");
@@ -607,16 +616,6 @@ class WallpaperController {
                             mUpperWallpaperTarget = oldW;
                             mLowerWallpaperTarget = wallpaperTarget;
                         }
-
-                        // If the new target is going hidden, set it back to the old target.
-                        if (wallpaperTarget.mAppToken != null
-                                && wallpaperTarget.mAppToken.hiddenRequested) {
-                            if (DEBUG_WALLPAPER_LIGHT) Slog.v(TAG,
-                                    "Old wallpaper still the target.");
-                            mWallpaperTarget = oldW;
-                            wallpaperTarget = oldW;
-                            wallpaperTargetIndex = oldI;
-                        }
                     }
                 }
             }

services/core/java/com/android/server/wm/WindowSurfacePlacer.java

@@ -1097,26 +1097,6 @@ class WindowSurfacePlacer {
         boolean fullscreenAnim = false;
         boolean voiceInteraction = false;
 
-        int i;
-        for (i = 0; i < appsCount; i++) {
-            final AppWindowToken wtoken = mService.mOpeningApps.valueAt(i);
-            // Clearing the mAnimatingExit flag before entering animation. It's set to
-            // true if app window is removed, or window relayout to invisible.
-            // This also affects window visibility. We need to clear it *before*
-            // maybeUpdateTransitToWallpaper() as the transition selection depends on
-            // wallpaper target visibility.
-            wtoken.clearAnimatingFlags();
-
-        }
-        // Adjust wallpaper before we pull the lower/upper target, since pending changes
-        // (like the clearAnimatingFlags() above) might affect wallpaper target result.
-        final DisplayContent displayContent = mService.getDefaultDisplayContentLocked();
-        if ((displayContent.pendingLayoutChanges & FINISH_LAYOUT_REDO_WALLPAPER) != 0 &&
-                mWallpaperControllerLocked.adjustWallpaperWindows()) {
-            mService.mLayersController.assignLayersLocked(windows);
-            displayContent.layoutNeeded = true;
-        }
-
         final WindowState lowerWallpaperTarget =
                 mWallpaperControllerLocked.getLowerWallpaperTarget();
         final WindowState upperWallpaperTarget =
@@ -1133,6 +1113,7 @@ class WindowSurfacePlacer {
             upperWallpaperAppToken = upperWallpaperTarget.mAppToken;
         }
 
+        int i;
         // Do a first pass through the tokens for two
         // things:
         // (1) Determine if both the closing and opening
@@ -1157,6 +1138,12 @@ class WindowSurfacePlacer {
                 if (wtoken == lowerWallpaperAppToken || wtoken == upperWallpaperAppToken) {
                     openingAppHasWallpaper = true;
                 }
+                // Clearing the mAnimatingExit flag before entering animation. It's set to
+                // true if app window is removed, or window relayout to invisible.
+                // This also affects window visibility. We need to clear it *before*
+                // maybeUpdateTransitToWallpaper() as the transition selection depends on
+                // wallpaper target visibility.
+                wtoken.clearAnimatingFlags();
             }
 
             voiceInteraction |= wtoken.voiceInteraction;
@@ -1219,7 +1206,7 @@ class WindowSurfacePlacer {
 
         // This has changed the visibility of windows, so perform
         // a new layout to get them all up-to-date.
-        displayContent.layoutNeeded = true;
+        mService.getDefaultDisplayContentLocked().layoutNeeded = true;
 
         // TODO(multidisplay): IMEs are only supported on the default display.
         if (windows == mService.getDefaultWindowListLocked()