Fix crash and side effects on double rotation with modal

react-native-gutenberg-bridge/android/src/main/java/org/wordpress/mobile/ReactNativeGutenbergBridge/RNReactNativeGutenbergBridgeModule.java

@@ -35,6 +35,8 @@ public class RNReactNativeGutenbergBridgeModule extends ReactContextBaseJavaModu
     private static final String EVENT_NAME_FOCUS_TITLE = "setFocusOnTitle";
     private static final String EVENT_NAME_MEDIA_UPLOAD = "mediaUpload";
     private static final String EVENT_NAME_MEDIA_APPEND = "mediaAppend";
+    private static final String EVENT_NAME_TOGGLE_HTML_MODE = "toggleHTMLMode";
+    private static final String EVENT_NAME_NOTIFY_MODAL_CLOSED = "notifyModalClosed";
 
     private static final String MAP_KEY_UPDATE_HTML = "html";
     private static final String MAP_KEY_UPDATE_TITLE = "title";
@@ -285,6 +287,10 @@ private void setMediaFileUploadDataInJS(int state, int mediaId, String mediaUrl,
     }
 
     public void toggleEditorMode() {
-        emitToJS("toggleHTMLMode", null);
+        emitToJS(EVENT_NAME_TOGGLE_HTML_MODE, null);
+    }
+
+    public void notifyModalClosed() {
+        emitToJS(EVENT_NAME_NOTIFY_MODAL_CLOSED, null);
     }
 }

react-native-gutenberg-bridge/android/src/main/java/org/wordpress/mobile/WPAndroidGlue/WPAndroidGlueCode.java

@@ -470,6 +470,11 @@ public void invokeDefaultOnBackPressed() {
         }
     }
 
+    public void onDetach(Activity activity) {
+        mReactInstanceManager.onHostDestroy(activity);
+        mRnReactNativeGutenbergBridgePackage.getRNReactNativeGutenbergBridgeModule().notifyModalClosed();
+    }
+
     public void onDestroy(Activity activity) {
         if (mReactRootView != null) {
             mReactRootView.unmountReactApplication();

react-native-gutenberg-bridge/index.js

@@ -7,6 +7,7 @@ import { NativeModules, NativeEventEmitter, Platform } from 'react-native';
 
 const { RNReactNativeGutenbergBridge } = NativeModules;
 const isIOS = Platform.OS === 'ios';
+const isAndroid = Platform.OS === 'android';
 
 const gutenbergBridgeEvents = new NativeEventEmitter( RNReactNativeGutenbergBridge );
 
@@ -70,6 +71,10 @@ export function subscribeMediaAppend( callback ) {
 	return gutenbergBridgeEvents.addListener( 'mediaAppend', callback );
 }
 
+export function subscribeAndroidModalClosed( callback ) {
+	return isAndroid ? gutenbergBridgeEvents.addListener( 'notifyModalClosed', callback ) : undefined;
+}
+
 /**
  * Request media picker for the given media source.
  *