Stop auto-correcting non-whitelisted one-char strings

Bug: 7134017
Change-Id: I75cf474dedafda3e1683dd8f7740c13aafdcf5ab

java/src/com/android/inputmethod/latin/AutoCorrection.java

@@ -73,11 +73,11 @@ public class AutoCorrection {
         return maxFreq;
     }
 
-    // Returns true if this isn't in any dictionary.
-    public static boolean isNotAWord(
+    // Returns true if this is in any of the dictionaries.
+    public static boolean isInTheDictionary(
             final ConcurrentHashMap<String, Dictionary> dictionaries,
             final CharSequence word, final boolean ignoreCase) {
-        return !isValidWord(dictionaries, word, ignoreCase);
+        return isValidWord(dictionaries, word, ignoreCase);
     }
 
     public static boolean suggestionExceedsAutoCorrectionThreshold(SuggestedWordInfo suggestion,

java/src/com/android/inputmethod/latin/Suggest.java

@@ -214,10 +214,12 @@ public class Suggest {
             whitelistedWord = suggestionsSet.first().mWord;
         }
 
+        // The word can be auto-corrected if it has a whitelist entry that is not itself,
+        // or if it's a 2+ characters non-word (i.e. it's not in the dictionary).
         final boolean allowsToBeAutoCorrected = (null != whitelistedWord
                 && !whitelistedWord.equals(consideredWord))
-                || AutoCorrection.isNotAWord(mDictionaries, consideredWord,
-                        wordComposer.isFirstCharCapitalized());
+                || (consideredWord.length() > 1 && !AutoCorrection.isInTheDictionary(mDictionaries,
+                        consideredWord, wordComposer.isFirstCharCapitalized()));
 
         final boolean hasAutoCorrection;
         // TODO: using isCorrectionEnabled here is not very good. It's probably useless, because