fix nullsafe FIXMEs for ReactTextViewManager.java and mark nullsafe

Summary:
Gone trough all the FIXMEs added in the previous diff by the nullsafe tool, marked the class as nullsafe and ensured no remaining violations.
Changelog: [Android][Fixed] Made ReactTextViewManager.java nullsafe

Reviewed By: javache

Differential Revision: D72460124

fbshipit-source-id: a75705ac4ab486ccaa9162dee5bfd8cae77967c7

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/views/text/ReactTextViewManager.java

@@ -13,6 +13,7 @@ import android.text.Spannable;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import com.facebook.common.logging.FLog;
+import com.facebook.infer.annotation.Nullsafe;
 import com.facebook.react.R;
 import com.facebook.react.common.MapBuilder;
 import com.facebook.react.common.annotations.VisibleForTesting;
@@ -35,6 +36,7 @@ import java.util.Map;
  * Concrete class for {@link ReactTextAnchorViewManager} which represents view managers of anchor
  * {@code <Text>} nodes.
  */
+@Nullsafe(Nullsafe.Mode.LOCAL)
 @ReactModule(name = ReactTextViewManager.REACT_CLASS)
 public class ReactTextViewManager
     extends ReactTextAnchorViewManager<ReactTextView, ReactTextShadowNode>
@@ -143,14 +145,13 @@ public class ReactTextViewManager
   }
 
   @Override
-  public Object updateState(
+  public @Nullable Object updateState(
       ReactTextView view, ReactStylesDiffMap props, StateWrapper stateWrapper) {
     try (SystraceSection s = new SystraceSection("ReactTextViewManager.updateState")) {
       MapBuffer stateMapBuffer = stateWrapper.getStateDataMapBuffer();
       if (stateMapBuffer != null) {
         return getReactTextUpdate(view, props, stateMapBuffer);
       } else {
-        // NULLSAFE_FIXME[Return Not Nullable]
         return null;
       }
     }
@@ -225,7 +226,6 @@ public class ReactTextViewManager
         widthMode,
         height,
         heightMode,
-        // NULLSAFE_FIXME[Parameter Not Nullable]
         mReactTextViewManagerCallback,
         attachmentsPositions);
   }

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/views/text/TextLayoutManager.java

@@ -502,7 +502,7 @@ public class TextLayoutManager {
       MapBuffer paragraphAttributes,
       float width,
       float height,
-      ReactTextViewManagerCallback reactTextViewManagerCallback) {
+      @Nullable ReactTextViewManagerCallback reactTextViewManagerCallback) {
     Spannable text =
         getOrCreateSpannableForText(context, attributedString, reactTextViewManagerCallback);
 
@@ -666,7 +666,7 @@ public class TextLayoutManager {
       YogaMeasureMode widthYogaMeasureMode,
       float height,
       YogaMeasureMode heightYogaMeasureMode,
-      ReactTextViewManagerCallback reactTextViewManagerCallback,
+      @Nullable ReactTextViewManagerCallback reactTextViewManagerCallback,
       @Nullable float[] attachmentsPositions) {
     // TODO(5578671): Handle text direction (see View#getTextDirectionHeuristic)
     Layout layout =