Update Section hierarchy when child views change

Summary:
we only include in the inspector hierarchy the sections which are visible on screen. If as a result of a UI change the hierarchy of visible sections changes (for example when scrolling to a section that wasn't previously visible) this forces the section hierarchy to be recreated.
passy not sure if there's an easier way of making the children of a node invalidate, let me know if you have any suggestions
Depends on D14300298

Reviewed By: passy

Differential Revision: D14301404

fbshipit-source-id: 551e1910d0a80238027e32417aab8d42ed1c00b3

android/src/main/java/com/facebook/flipper/plugins/inspector/NodeDescriptor.java

@@ -49,7 +49,7 @@ public abstract class NodeDescriptor<T> {
    * and/or children have changed. This will trigger Flipper to re-query this node getting any new
    * data.
    */
-  protected final void invalidate(final T node) {
+  public void invalidate(final T node) {
     if (mConnection != null) {
       new ErrorReportingRunnable(mConnection) {
         @Override

android/src/main/java/com/facebook/flipper/plugins/inspector/descriptors/ViewGroupDescriptor.java

@@ -74,7 +74,8 @@ public class ViewGroupDescriptor extends NodeDescriptor<ViewGroup> {
             public void runOrThrow() throws Exception {
               if (connected()) {
                 if (key.set(node)) {
-                  invalidate(node);
+                  NodeDescriptor descriptor = descriptorForClass(node.getClass());
+                  descriptor.invalidate(node);
                   invalidateAX(node);
                 }
 

android/src/main/java/com/facebook/flipper/plugins/litho/DebugSectionDescriptor.java

@@ -11,6 +11,7 @@ import android.view.View;
 import android.view.ViewGroup;
 import androidx.core.view.MarginLayoutParamsCompat;
 import androidx.core.view.ViewCompat;
+import com.facebook.flipper.core.ErrorReportingRunnable;
 import com.facebook.flipper.core.FlipperDynamic;
 import com.facebook.flipper.core.FlipperObject;
 import com.facebook.flipper.plugins.inspector.HighlightedOverlay;
@@ -22,6 +23,24 @@ import java.util.ArrayList;
 import java.util.List;
 
 public class DebugSectionDescriptor extends NodeDescriptor<DebugSection> {
+
+  @Override
+  public void invalidate(final DebugSection debugSection) {
+    super.invalidate(debugSection);
+
+    new ErrorReportingRunnable(mConnection) {
+      @Override
+      protected void runOrThrow() throws Exception {
+        for (int i = 0; i < getChildCount(debugSection); i++) {
+          Object child = getChildAt(debugSection, i);
+          if (child instanceof DebugSection) {
+            invalidate((DebugSection) child);
+          }
+        }
+      }
+    }.run();
+  }
+
   @Override
   public void init(DebugSection node) throws Exception {}
 

android/src/main/java/com/facebook/flipper/plugins/litho/LithoRecyclerViewDescriptor.java

@@ -19,8 +19,30 @@ import java.util.ArrayList;
 import java.util.List;
 
 public class LithoRecyclerViewDescriptor extends NodeDescriptor<LithoRecylerView> {
+
   @Override
-  public void init(LithoRecylerView node) throws Exception {}
+  public void invalidate(final LithoRecylerView node) {
+    super.invalidate(node);
+
+    new com.facebook.flipper.core.ErrorReportingRunnable(mConnection) {
+      @Override
+      protected void runOrThrow() throws Exception {
+        final Object child;
+        child = getChildAt(node, 0);
+        if (child instanceof DebugSection) {
+          DebugSection childSection = (DebugSection) child;
+          final NodeDescriptor descriptor = descriptorForClass(DebugSection.class);
+          descriptor.invalidate(childSection);
+        }
+      }
+    }.run();
+  }
+
+  @Override
+  public void init(final LithoRecylerView node) throws Exception {
+    final NodeDescriptor descriptor = descriptorForClass(ViewGroup.class);
+    descriptor.init(node);
+  }
 
   @Override
   public String getId(LithoRecylerView node) throws Exception {