Report caption insets change when layout

This patch let DecorCaptionView report back to it's owner about height
change, instead of let the DecorView query the height. The previous
query points enableCaption() and updateDecorCaptionStatus() cannot
ensure the caption layout is finished and attached to the phone window.
Such that it may return a zero caption insets when it shouldn't be, if
the app do window configuration change handling by restarting.

The layout will ensure the caption insets get set when everything is
ready.

There will be no caption height change when resizing or moving, make
sure the calculated insets always include the caption regardless of the
frame position.

Bug: 154792488
Test: Manuel test with message and settings app.
Test: go/wm-smoke
Test: atest InsetsControllerTest#testCaptionInsetsStateAssemble
Test: atest InsetsSourceTest#testCalculateInsets_caption_resizing
Change-Id: I1728628eccb32b912210a64fe3a1c9cbe9e3b302

core/java/com/android/internal/policy/DecorView.java

@@ -2019,10 +2019,17 @@ public class DecorView extends FrameLayout implements RootViewSurfaceTaker, Wind
             if (getForeground() != null) {
                 drawableChanged();
             }
-            getWindowInsetsController().setCaptionInsetsHeight(getCaptionInsetsHeight());
         }
     }
 
+    /**
+     * An interface to be called when the caption visibility or height changed, to report the
+     * corresponding insets change to the InsetsController.
+     */
+    public void notifyCaptionHeightChanged() {
+        getWindowInsetsController().setCaptionInsetsHeight(getCaptionInsetsHeight());
+    }
+
     void setWindow(PhoneWindow phoneWindow) {
         mWindow = phoneWindow;
         Context context = getContext();
@@ -2093,7 +2100,6 @@ public class DecorView extends FrameLayout implements RootViewSurfaceTaker, Wind
             mDecorCaptionView.onConfigurationChanged(displayWindowDecor);
             enableCaption(displayWindowDecor);
         }
-        getWindowInsetsController().setCaptionInsetsHeight(getCaptionInsetsHeight());
     }
 
     void onResourcesLoaded(LayoutInflater inflater, int layoutResource) {

core/java/com/android/internal/widget/DecorCaptionView.java

@@ -30,6 +30,7 @@ import android.view.ViewOutlineProvider;
 import android.view.Window;
 
 import com.android.internal.R;
+import com.android.internal.policy.DecorView;
 import com.android.internal.policy.PhoneWindow;
 
 import java.util.ArrayList;
@@ -305,6 +306,8 @@ public class DecorCaptionView extends ViewGroup implements View.OnTouchListener,
             }
         }
 
+        ((DecorView) mOwner.getDecorView()).notifyCaptionHeightChanged();
+
         // This assumes that the caption bar is at the top.
         mOwner.notifyRestrictedCaptionAreaCallback(mMaximize.getLeft(), mMaximize.getTop(),
                 mClose.getRight(), mClose.getBottom());