Fix translucent activities when unfolding

In the unfold process only the top activity bounds were calculated.
Now we update the bounds of the first opaque activity beneath.

Bug: 261721427
Test: Run `atest SizeCompatTests`

Change-Id: I5895a417aecdc66d1b17184cbe700ef1da5e1148

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

@@ -8293,7 +8293,13 @@ final class ActivityRecord extends WindowToken implements WindowManagerService.A
     }
 
     void recomputeConfiguration() {
-        onRequestedOverrideConfigurationChanged(getRequestedOverrideConfiguration());
+        // We check if the current activity is transparent. In that case we need to
+        // recomputeConfiguration of the first opaque activity beneath, to allow a
+        // proper computation of the new bounds.
+        if (!mLetterboxUiController.applyOnOpaqueActivityBelow(
+                ActivityRecord::recomputeConfiguration)) {
+            onRequestedOverrideConfigurationChanged(getRequestedOverrideConfiguration());
+        }
     }
 
     boolean isInTransition() {

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

@@ -81,6 +81,7 @@ import static com.android.server.wm.LetterboxConfiguration.letterboxBackgroundTy
 import static java.lang.Boolean.FALSE;
 import static java.lang.Boolean.TRUE;
 
+import android.annotation.NonNull;
 import android.annotation.Nullable;
 import android.app.ActivityManager.TaskDescription;
 import android.content.pm.ActivityInfo.ScreenOrientation;
@@ -104,7 +105,9 @@ import com.android.internal.statusbar.LetterboxDetails;
 import com.android.server.wm.LetterboxConfiguration.LetterboxBackgroundType;
 
 import java.io.PrintWriter;
+import java.util.Optional;
 import java.util.function.BooleanSupplier;
+import java.util.function.Consumer;
 import java.util.function.Predicate;
 
 /** Controls behaviour of the letterbox UI for {@link mActivityRecord}. */
@@ -1471,6 +1474,32 @@ final class LetterboxUiController {
         return mInheritedCompatDisplayInsets;
     }
 
+    /**
+     * In case of translucent activities, it consumes the {@link ActivityRecord} of the first opaque
+     * activity beneath using the given consumer and returns {@code true}.
+     */
+    boolean applyOnOpaqueActivityBelow(@NonNull Consumer<ActivityRecord> consumer) {
+        return findOpaqueNotFinishingActivityBelow()
+                .map(activityRecord -> {
+                    consumer.accept(activityRecord);
+                    return true;
+                }).orElse(false);
+    }
+
+    /**
+     * @return The first not finishing opaque activity beneath the current translucent activity
+     * if it exists and the strategy is enabled.
+     */
+    private Optional<ActivityRecord> findOpaqueNotFinishingActivityBelow() {
+        if (!hasInheritedLetterboxBehavior() || mActivityRecord.getTask() == null) {
+            return Optional.empty();
+        }
+        return Optional.ofNullable(mActivityRecord.getTask().getActivity(
+                FIRST_OPAQUE_NOT_FINISHING_ACTIVITY_PREDICATE /* callback */,
+                mActivityRecord /* boundary */, false /* includeBoundary */,
+                true /* traverseTopToBottom */));
+    }
+
     private void inheritConfiguration(ActivityRecord firstOpaque) {
         // To avoid wrong behaviour, we're not forcing a specific aspet ratio to activities
         // which are not already providing one (e.g. permission dialogs) and presumably also

services/tests/wmtests/src/com/android/server/wm/SizeCompatTests.java

@@ -270,6 +270,35 @@ public class SizeCompatTests extends WindowTestsBase {
         verify(mActivity).isFinishing();
     }
 
+    @Test
+    public void testTranslucentActivitiesWhenUnfolding() {
+        mWm.mLetterboxConfiguration.setTranslucentLetterboxingOverrideEnabled(true);
+        setUpDisplaySizeWithApp(2800, 1400);
+        mActivity.mDisplayContent.setIgnoreOrientationRequest(true /* ignoreOrientationRequest */);
+        mActivity.mWmService.mLetterboxConfiguration.setLetterboxHorizontalPositionMultiplier(
+                1.0f /*letterboxVerticalPositionMultiplier*/);
+        prepareUnresizable(mActivity, SCREEN_ORIENTATION_PORTRAIT);
+        // We launch a transparent activity
+        final ActivityRecord translucentActivity = new ActivityBuilder(mAtm)
+                .setLaunchedFromUid(mActivity.getUid())
+                .setScreenOrientation(SCREEN_ORIENTATION_PORTRAIT)
+                .build();
+        doReturn(false).when(translucentActivity).fillsParent();
+        mTask.addChild(translucentActivity);
+
+        mTask.setWindowingMode(WINDOWING_MODE_FULLSCREEN);
+        spyOn(mActivity);
+
+        // Halffold
+        setFoldablePosture(translucentActivity, true /* isHalfFolded */, false /* isTabletop */);
+        verify(mActivity).recomputeConfiguration();
+        clearInvocations(mActivity);
+
+        // Unfold
+        setFoldablePosture(translucentActivity, false /* isHalfFolded */, false /* isTabletop */);
+        verify(mActivity).recomputeConfiguration();
+    }
+
     @Test
     public void testRestartProcessIfVisible() {
         setUpDisplaySizeWithApp(1000, 2500);
@@ -3339,14 +3368,20 @@ public class SizeCompatTests extends WindowTestsBase {
 
     }
 
-    private void setFoldablePosture(boolean isHalfFolded, boolean isTabletop) {
-        final DisplayRotation r = mActivity.mDisplayContent.getDisplayRotation();
+    private void setFoldablePosture(ActivityRecord activity, boolean isHalfFolded,
+            boolean isTabletop) {
+        final DisplayRotation r = activity.mDisplayContent.getDisplayRotation();
         doReturn(isHalfFolded).when(r).isDisplaySeparatingHinge();
         doReturn(false).when(r).isDeviceInPosture(any(DeviceState.class), anyBoolean());
         if (isHalfFolded) {
-            doReturn(true).when(r).isDeviceInPosture(DeviceState.HALF_FOLDED, isTabletop);
+            doReturn(true).when(r)
+                    .isDeviceInPosture(DeviceState.HALF_FOLDED, isTabletop);
         }
-        mActivity.recomputeConfiguration();
+        activity.recomputeConfiguration();
+    }
+
+    private void setFoldablePosture(boolean isHalfFolded, boolean isTabletop) {
+        setFoldablePosture(mActivity, isHalfFolded, isTabletop);
     }
 
     @Test