Workaround for slow -1 drawing when swiping home

- Recents animation is the one most affected by this visually (other
  transitions are blocked from starting entirely, which is another
  issue).  TLDR, the -1 is always visible by modulates the alpha
  of its window as the user swipes to/from it.  As such, it's still
  considered an interesting window for allDrawn purposes, but in rare
  cases, AGSA may not be scheduled and the drawing of the -1 window
  even if it is alpha=0, will block Launcher's allDrawn state and
  prevent the Launcher surface from being shown.

  As a workaround, we ignore non-base windows associated with the
  recents animation target activity if their alpha is 0 for the purposes
  of considering when all windows are drawn.

Bug: 245407006
Test: TBD
Change-Id: I91ed411eb36e23f22c0a3b2bbbd80b6632b8c0b5

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

@@ -116,7 +116,7 @@ public class RecentsAnimationController implements DeathRecipient {
     private boolean mWillFinishToHome = false;
     private final Runnable mFailsafeRunnable = this::onFailsafe;
 
-    // The recents component app token that is shown behind the visibile tasks
+    // The recents component app token that is shown behind the visible tasks
     private ActivityRecord mTargetActivityRecord;
     private DisplayContent mDisplayContent;
     private int mTargetActivityType;
@@ -457,6 +457,22 @@ public class RecentsAnimationController implements DeathRecipient {
         }
     }
 
+    /**
+     * Return whether the given window should still be considered interesting for the all-drawn
+     * state.  This is only interesting for the target app, which may have child windows that are
+     * not actually visible and should not be considered interesting and waited upon.
+     */
+    protected boolean isInterestingForAllDrawn(WindowState window) {
+        if (isTargetApp(window.getActivityRecord())) {
+            if (window.getWindowType() != TYPE_BASE_APPLICATION
+                    && window.getAttrs().alpha == 0f) {
+                // If there is a cihld window that is alpha 0, then ignore that window
+                return false;
+            }
+        }
+        // By default all windows are still interesting for all drawn purposes
+        return true;
+    }
 
     /**
      * Whether a task should be filtered from the recents animation. This can be true for tasks

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

@@ -2043,9 +2043,13 @@ class WindowState extends WindowContainer<WindowState> implements WindowManagerP
      * it must be drawn before allDrawn can become true.
      */
     boolean isInteresting() {
+        final RecentsAnimationController recentsAnimationController =
+                mWmService.getRecentsAnimationController();
         return mActivityRecord != null && !mAppDied
                 && (!mActivityRecord.isFreezingScreen() || !mAppFreezing)
-                && mViewVisibility == View.VISIBLE;
+                && mViewVisibility == View.VISIBLE
+                && (recentsAnimationController == null
+                         || recentsAnimationController.isInterestingForAllDrawn(this));
     }
 
     /**