Stop filtering out when perfect freq > top non-perfect freq.

Bug: 13142176
Change-Id: I0290df918a5bd5018bf55231dc462d5e797155c6

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

@@ -408,7 +408,7 @@ public class DictionaryFacilitator {
         if (userHistoryDictionary == null) {
             return;
         }
-        final int maxFreq = getMaxFrequency(word);
+        final int maxFreq = getFrequency(word);
         if (maxFreq == 0 && blockPotentiallyOffensive) {
             return;
         }
@@ -516,7 +516,7 @@ public class DictionaryFacilitator {
         return false;
     }
 
-    private int getMaxFrequency(final String word) {
+    public int getFrequency(final String word) {
         if (TextUtils.isEmpty(word)) {
             return Dictionary.NOT_A_PROBABILITY;
         }

java/src/com/android/inputmethod/latin/utils/DistracterFilterUsingSuggestion.java

@@ -33,6 +33,7 @@ import com.android.inputmethod.keyboard.Keyboard;
 import com.android.inputmethod.keyboard.KeyboardId;
 import com.android.inputmethod.keyboard.KeyboardLayoutSet;
 import com.android.inputmethod.latin.Constants;
+import com.android.inputmethod.latin.Dictionary;
 import com.android.inputmethod.latin.DictionaryFacilitator;
 import com.android.inputmethod.latin.PrevWordsInfo;
 import com.android.inputmethod.latin.SuggestedWords.SuggestedWordInfo;
@@ -98,10 +99,12 @@ public class DistracterFilterUsingSuggestion implements DistracterFilter {
         }
     }
 
-    private static boolean isDistracter(
+    private boolean isDistracter(
             final SuggestionResults suggestionResults, final String consideredWord) {
+        int perfectMatchProbability = Dictionary.NOT_A_PROBABILITY;
         for (final SuggestedWordInfo suggestedWordInfo : suggestionResults) {
             if (suggestedWordInfo.mWord.equals(consideredWord)) {
+                perfectMatchProbability = mDictionaryFacilitator.getFrequency(consideredWord);
                 continue;
             }
             // Exact match can include case errors, accent errors, digraph conversions.
@@ -121,6 +124,17 @@ public class DistracterFilterUsingSuggestion implements DistracterFilter {
                 Log.d(TAG, "isExactMatchWithIntentionalOmission: "
                             + isExactMatchWithIntentionalOmission);
             }
+            if (perfectMatchProbability != Dictionary.NOT_A_PROBABILITY) {
+                final int topNonPerfectProbability = mDictionaryFacilitator.getFrequency(
+                        suggestedWordInfo.mWord);
+                if (DEBUG) {
+                    Log.d(TAG, "perfectMatchProbability: " + perfectMatchProbability);
+                    Log.d(TAG, "topNonPerfectProbability: " + topNonPerfectProbability);
+                }
+                if (perfectMatchProbability > topNonPerfectProbability) {
+                    return false;
+                }
+            }
             return isExactMatch || isExactMatchWithIntentionalOmission;
         }
         return false;

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

@@ -57,11 +57,36 @@ public class DistracterFilterTest extends InputTestsBase {
         assertTrue(mDistracterFilter.isDistracterToWordsInDictionaries(
                 EMPTY_PREV_WORDS_INFO, typedWord, localeEnUs));
 
-        typedWord = "were";
+        typedWord = "youre";
-        // For this test case, we consider "were" is a distracter to "we're".
+        // For this test case, we consider "youre" is a distracter to "you're".
         assertTrue(mDistracterFilter.isDistracterToWordsInDictionaries(
                 EMPTY_PREV_WORDS_INFO, typedWord, localeEnUs));
 
+        typedWord = "Banana";
+        // For this test case, we consider "Banana" is a distracter to "banana".
+        assertTrue(mDistracterFilter.isDistracterToWordsInDictionaries(
+                EMPTY_PREV_WORDS_INFO, typedWord, localeEnUs));
+
+        typedWord = "orange";
+        // For this test case, we consider "orange" is not a distracter to any word in dictionaries.
+        assertFalse(mDistracterFilter.isDistracterToWordsInDictionaries(
+                EMPTY_PREV_WORDS_INFO, typedWord, localeEnUs));
+
+        typedWord = "Orange";
+        // For this test case, we consider "Orange" is a distracter to "orange".
+        assertTrue(mDistracterFilter.isDistracterToWordsInDictionaries(
+                EMPTY_PREV_WORDS_INFO, typedWord, localeEnUs));
+
+        typedWord = "café";
+        // For this test case, we consider "café" is a distracter to "cafe".
+        assertTrue(mDistracterFilter.isDistracterToWordsInDictionaries(
+                EMPTY_PREV_WORDS_INFO, typedWord, localeEnUs));
+
+        typedWord = "cafe";
+        // For this test case, we consider "café" is not a distracter to any word in dictionaries.
+        assertFalse(mDistracterFilter.isDistracterToWordsInDictionaries(
+                EMPTY_PREV_WORDS_INFO, typedWord, localeEnUs));
+
         typedWord = "ill";
         // For this test case, we consider "ill" is not a distracter to any word in dictionaries.
         assertFalse(mDistracterFilter.isDistracterToWordsInDictionaries(