Fix a bug with multiple word insertion.

This is a port of I5202bc52

Bug: 7903831
Change-Id: I3eb526de01a1f5b51212166e39b98de1d71e9eaf

java/src/com/android/inputmethod/latin/userdictionary/UserDictionaryAddWordContents.java

@@ -65,6 +65,8 @@ public class UserDictionaryAddWordContents {
     private String mLocale;
     private final String mOldWord;
     private final String mOldShortcut;
+    private String mSavedWord;
+    private String mSavedShortcut;
 
     /* package */ UserDictionaryAddWordContents(final View view, final Bundle args) {
         mWordEditText = (EditText)view.findViewById(R.id.user_dictionary_add_word_text);
@@ -96,6 +98,16 @@ public class UserDictionaryAddWordContents {
         updateLocale(args.getString(EXTRA_LOCALE));
     }
 
+    /* package */ UserDictionaryAddWordContents(final View view,
+            final UserDictionaryAddWordContents oldInstanceToBeEdited) {
+        mWordEditText = (EditText)view.findViewById(R.id.user_dictionary_add_word_text);
+        mShortcutEditText = (EditText)view.findViewById(R.id.user_dictionary_add_shortcut);
+        mMode = MODE_EDIT;
+        mOldWord = oldInstanceToBeEdited.mSavedWord;
+        mOldShortcut = oldInstanceToBeEdited.mSavedShortcut;
+        updateLocale(mLocale);
+    }
+
     // locale may be null, this means default locale
     // It may also be the empty string, which means "all locales"
     /* package */ void updateLocale(final String locale) {
@@ -149,6 +161,8 @@ public class UserDictionaryAddWordContents {
             // If the word is somehow empty, don't insert it.
             return CODE_CANCEL;
         }
+        mSavedWord = newWord;
+        mSavedShortcut = newShortcut;
         // If there is no shortcut, and the word already exists in the database, then we
         // should not insert, because either A. the word exists with no shortcut, in which
         // case the exact same thing we want to insert is already there, or B. the word

java/src/com/android/inputmethod/latin/userdictionary/UserDictionaryAddWordFragment.java

@@ -57,23 +57,36 @@ public class UserDictionaryAddWordFragment extends Fragment
     private boolean mIsDeleting = false;
 
     @Override
-    public void onActivityCreated(Bundle savedInstanceState) {
+    public void onActivityCreated(final Bundle savedInstanceState) {
         super.onActivityCreated(savedInstanceState);
         setHasOptionsMenu(true);
+        // Keep the instance so that we remember mContents when configuration changes (eg rotation)
+        setRetainInstance(true);
     }
 
     @Override
-    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedState) {
+    public View onCreateView(final LayoutInflater inflater, final ViewGroup container,
+            final Bundle savedState) {
         mRootView = inflater.inflate(R.layout.user_dictionary_add_word_fullscreen, null);
         mIsDeleting = false;
+        // If we have a non-null mContents object, it's the old value before a configuration
+        // change (eg rotation) so we need to use its values. Otherwise, read from the arguments.
         if (null == mContents) {
             mContents = new UserDictionaryAddWordContents(mRootView, getArguments());
+        } else {
+            // We create a new mContents object to account for the new situation : a word has
+            // been added to the user dictionary when we started rotating, and we are now editing
+            // it. That means in particular if the word undergoes any change, the old version should
+            // be updated, so the mContents object needs to switch to EDIT mode if it was in
+            // INSERT mode.
+            mContents = new UserDictionaryAddWordContents(mRootView,
+                    mContents /* oldInstanceToBeEdited */);
         }
         return mRootView;
     }
 
     @Override
-    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
+    public void onCreateOptionsMenu(final Menu menu, final MenuInflater inflater) {
         final MenuItem actionItemAdd = menu.add(0, OPTIONS_MENU_ADD, 0,
                 R.string.user_dict_settings_add_menu_title).setIcon(R.drawable.ic_menu_add);
         actionItemAdd.setShowAsAction(