fix findWordInTree.

Change-Id: I8f42df28f76188677db9d4e55885e1fc6a40b53f

java/src/com/android/inputmethod/latin/makedict/FusionDictionary.java

@@ -532,6 +532,7 @@ public class FusionDictionary implements Iterable<Word> {
         } while (null != node && index < s.length());
 
         if (index < s.length()) return null;
+        if (!currentGroup.isTerminal()) return null;
         if (DBG && !s.equals(checker.toString())) return null;
         return currentGroup;
     }

tests/src/com/android/inputmethod/latin/FusionDictionaryTests.java

@@ -38,5 +38,11 @@ public class FusionDictionaryTests extends AndroidTestCase {
         dict.add("aa", 10, null);
         assertNull(FusionDictionary.findWordInTree(dict.mRoot, "aaa"));
         assertNotNull(FusionDictionary.findWordInTree(dict.mRoot, "aa"));
+
+        dict.add("babcd", 10, null);
+        dict.add("bacde", 10, null);
+        assertNull(FusionDictionary.findWordInTree(dict.mRoot, "ba"));
+        assertNotNull(FusionDictionary.findWordInTree(dict.mRoot, "babcd"));
+        assertNotNull(FusionDictionary.findWordInTree(dict.mRoot, "bacde"));
     }
 }