diff --git a/java/res/values-hi/strings.xml b/java/res/values-hi/strings.xml
index de95ab8..58d515d 100644
--- a/java/res/values-hi/strings.xml
+++ b/java/res/values-hi/strings.xml
@@ -37,7 +37,7 @@
     <string name="advanced_settings_summary" msgid="5193513161106637254">"विशेषज्ञ उपयोगकर्ताओं के लिए विकल्‍प"</string>
     <string name="key_preview_popup_dismiss_delay" msgid="6213164897443068248">"कुंजी पॉपअप खारिज़ विलंब"</string>
     <string name="key_preview_popup_dismiss_no_delay" msgid="2096123151571458064">"कोई विलंब नहीं"</string>
-    <string name="key_preview_popup_dismiss_default_delay" msgid="2166964333903906734">"डिफ़ॉल्ट"</string>
+    <string name="key_preview_popup_dismiss_default_delay" msgid="2166964333903906734">"डिफ़ॉल्ट"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"संपर्क नाम सुझाएं"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"सुझाव और सुधार के लिए संपर्क से नामों का उपयोग करें"</string>
     <string name="enable_span_insert" msgid="7204653105667167620">"पुन: सुधार सक्षम करें"</string>
diff --git a/java/res/values-vi/strings.xml b/java/res/values-vi/strings.xml
index ba831a4..fbfe93a 100644
--- a/java/res/values-vi/strings.xml
+++ b/java/res/values-vi/strings.xml
@@ -65,7 +65,7 @@
     <string name="label_go_key" msgid="1635148082137219148">"Đến"</string>
     <string name="label_next_key" msgid="362972844525672568">"Tiếp theo"</string>
     <string name="label_done_key" msgid="2441578748772529288">"Xong"</string>
-    <string name="label_send_key" msgid="2815056534433717444">"Gửi"</string>
+    <string name="label_send_key" msgid="2815056534433717444">"Gửi"</string>
     <string name="label_to_alpha_key" msgid="4793983863798817523">"ABC"</string>
     <string name="label_to_symbol_key" msgid="8516904117128967293">"?123"</string>
     <string name="label_to_symbol_with_microphone_key" msgid="9035925553010061906">"123"</string>
@@ -116,7 +116,7 @@
     <string name="voice_listening" msgid="467518160751321844">"Xin mời nói"</string>
     <string name="voice_working" msgid="6666937792815731889">"Đang hoạt động"</string>
     <string name="voice_initializing" msgid="661962047129906646"></string>
-    <string name="voice_error" msgid="5140896300312186162">"Lỗi. Vui lòng thử lại."</string>
+    <string name="voice_error" msgid="5140896300312186162">"Lỗi. Vui lòng thử lại."</string>
     <string name="voice_network_error" msgid="6649556447401862563">"Không thể kết nối"</string>
     <string name="voice_too_much_speech" msgid="5746973620134227376">"Lỗi, quá nhiều câu thoại."</string>
     <string name="voice_audio_error" msgid="5072707727016414454">"Sự cố âm thanh"</string>
@@ -143,7 +143,7 @@
     <string name="has_dictionary" msgid="6071847973466625007">"Có sẵn từ điển"</string>
     <string name="prefs_enable_log" msgid="6620424505072963557">"Bật phản hồi của người dùng"</string>
     <string name="prefs_description_log" msgid="5827825607258246003">"Giúp nâng cao trình chỉnh sửa phương thức nhập này bằng cách tự động gửi thống kê sử dụng và báo cáo sự cố cho Google."</string>
-    <string name="keyboard_layout" msgid="8451164783510487501">"Chủ đề bàn phím"</string>
+    <string name="keyboard_layout" msgid="8451164783510487501">"Chủ đề bàn phím"</string>
     <string name="subtype_de_qwerty" msgid="3358900499589259491">"Bàn phím QWERTY tiếng Đức"</string>
     <string name="subtype_en_GB" msgid="88170601942311355">"Tiếng Anh (Anh)"</string>
     <string name="subtype_en_US" msgid="6160452336634534239">"Tiếng Anh (Mỹ)"</string>
diff --git a/java/res/values/config.xml b/java/res/values/config.xml
index e2422d2..e4f5f37 100644
--- a/java/res/values/config.xml
+++ b/java/res/values/config.xml
@@ -80,8 +80,8 @@
              will be subject to auto-correction. -->
         <item>0</item>
     </string-array>
-    <!-- Threshold of the normalized score of the best suggestion for the spell checker to declare a word to be "likely" -->
-    <string name="spellchecker_likely_threshold_value" translatable="false">0.11</string>
+    <!-- Threshold of the normalized score of the best suggestion for the spell checker to declare a word to be "recommended" -->
+    <string name="spellchecker_recommended_threshold_value" translatable="false">0.11</string>
     <!-- Threshold of the normalized score of any dictionary lookup to be offered as a suggestion by the spell checker -->
     <string name="spellchecker_suggestion_threshold_value" translatable="false">0.03</string>
     <!--  Screen metrics for logging.
diff --git a/java/src/com/android/inputmethod/compat/InputMethodManagerCompatWrapper.java b/java/src/com/android/inputmethod/compat/InputMethodManagerCompatWrapper.java
index 51dc4cd..0e5f8c8 100644
--- a/java/src/com/android/inputmethod/compat/InputMethodManagerCompatWrapper.java
+++ b/java/src/com/android/inputmethod/compat/InputMethodManagerCompatWrapper.java
@@ -153,8 +153,7 @@
         return Utils.getInputMethodInfo(this, mLatinImePackageName);
     }
 
-    @SuppressWarnings("unused")
-    private InputMethodSubtypeCompatWrapper getLastResortSubtype(String mode) {
+    private static InputMethodSubtypeCompatWrapper getLastResortSubtype(String mode) {
         if (VOICE_MODE.equals(mode) && !FORCE_ENABLE_VOICE_EVEN_WITH_NO_VOICE_SUBTYPES)
             return null;
         Locale inputLocale = SubtypeSwitcher.getInstance().getInputLocale();
diff --git a/java/src/com/android/inputmethod/keyboard/Key.java b/java/src/com/android/inputmethod/keyboard/Key.java
index f1ae0b3..f2014b7 100644
--- a/java/src/com/android/inputmethod/keyboard/Key.java
+++ b/java/src/com/android/inputmethod/keyboard/Key.java
@@ -223,7 +223,7 @@
             if (style == null)
                 throw new ParseException("Unknown key style: " + styleName, parser);
         } else {
-            style = keyStyles.getEmptyKeyStyle();
+            style = KeyStyles.getEmptyKeyStyle();
         }
 
         final float keyXPos = row.getKeyX(keyAttr);
diff --git a/java/src/com/android/inputmethod/keyboard/Keyboard.java b/java/src/com/android/inputmethod/keyboard/Keyboard.java
index 4578507..a8bc745 100644
--- a/java/src/com/android/inputmethod/keyboard/Keyboard.java
+++ b/java/src/com/android/inputmethod/keyboard/Keyboard.java
@@ -75,7 +75,6 @@
     public static final int CODE_DELETE = -5;
     public static final int CODE_SETTINGS = -6;
     public static final int CODE_SHORTCUT = -7;
-    public static final int CODE_HAPTIC_AND_AUDIO_FEEDBACK_ONLY = -98;
     // Code value representing the code is not specified.
     public static final int CODE_UNSPECIFIED = -99;
 
diff --git a/java/src/com/android/inputmethod/keyboard/KeyboardSwitcher.java b/java/src/com/android/inputmethod/keyboard/KeyboardSwitcher.java
index ac718fc..4d30077 100644
--- a/java/src/com/android/inputmethod/keyboard/KeyboardSwitcher.java
+++ b/java/src/com/android/inputmethod/keyboard/KeyboardSwitcher.java
@@ -666,11 +666,16 @@
         return mKeyboardView == null ? 0 : mKeyboardView.getPointerCount();
     }
 
+    private boolean mPrevMainKeyboardWasShiftLocked;
+
     private void toggleKeyboardMode() {
         if (mCurrentId.equals(mMainKeyboardId)) {
+            mPrevMainKeyboardWasShiftLocked = isShiftLocked();
             setKeyboard(getKeyboard(mSymbolsKeyboardId));
         } else {
             setKeyboard(getKeyboard(mMainKeyboardId));
+            setShiftLocked(mPrevMainKeyboardWasShiftLocked);
+            mPrevMainKeyboardWasShiftLocked = false;
         }
     }
 
diff --git a/java/src/com/android/inputmethod/keyboard/KeyboardView.java b/java/src/com/android/inputmethod/keyboard/KeyboardView.java
index 04e6725..3ce1849 100644
--- a/java/src/com/android/inputmethod/keyboard/KeyboardView.java
+++ b/java/src/com/android/inputmethod/keyboard/KeyboardView.java
@@ -906,12 +906,16 @@
         int previewX = keyDrawX - (previewWidth - keyDrawWidth) / 2 + params.mCoordinates[0];
         final int previewY = key.mY - previewHeight
                 + params.mCoordinates[1] + params.mPreviewOffset;
-        if (previewX < 0 && params.mPreviewLeftBackground != null) {
-            previewText.setBackgroundDrawable(params.mPreviewLeftBackground);
+        if (previewX < 0) {
             previewX = 0;
-        } else if (previewX + previewWidth > getWidth() && params.mPreviewRightBackground != null) {
-            previewText.setBackgroundDrawable(params.mPreviewRightBackground);
+            if (params.mPreviewLeftBackground != null) {
+                previewText.setBackgroundDrawable(params.mPreviewLeftBackground);
+            }
+        } else if (previewX > getWidth() - previewWidth) {
             previewX = getWidth() - previewWidth;
+            if (params.mPreviewRightBackground != null) {
+                previewText.setBackgroundDrawable(params.mPreviewRightBackground);
+            }
         }
 
         // Set the preview background state
diff --git a/java/src/com/android/inputmethod/keyboard/LatinKeyboardView.java b/java/src/com/android/inputmethod/keyboard/LatinKeyboardView.java
index 6ce3876..b09628b 100644
--- a/java/src/com/android/inputmethod/keyboard/LatinKeyboardView.java
+++ b/java/src/com/android/inputmethod/keyboard/LatinKeyboardView.java
@@ -21,7 +21,6 @@
 import android.content.res.Resources;
 import android.graphics.Canvas;
 import android.os.Message;
-import android.os.SystemClock;
 import android.util.AttributeSet;
 import android.util.Log;
 import android.view.GestureDetector;
@@ -349,9 +348,11 @@
         // When shift key is double tapped, the first tap is correctly processed as usual tap. And
         // the second tap is treated as this double tap event, so that we need not mark tracker
         // calling setAlreadyProcessed() nor remove the tracker from mPointerQueue.
-        final int primaryCode = ignore ? Keyboard.CODE_HAPTIC_AND_AUDIO_FEEDBACK_ONLY
-                : Keyboard.CODE_CAPSLOCK;
-        invokeCodeInput(primaryCode);
+        if (ignore) {
+            mKeyboardActionListener.onCustomRequest(LatinIME.CODE_HAPTIC_AND_AUDIO_FEEDBACK);
+        } else {
+            mKeyboardActionListener.onCodeInput(Keyboard.CODE_CAPSLOCK, null, 0, 0);
+        }
     }
 
     // This default implementation returns a more keys panel.
@@ -463,8 +464,7 @@
                 this, this, pointX, pointY, mMoreKeysWindow, getKeyboardActionListener());
         final int translatedX = moreKeysPanel.translateX(tracker.getLastX());
         final int translatedY = moreKeysPanel.translateY(tracker.getLastY());
-        tracker.onShowMoreKeysPanel(
-                translatedX, translatedY, SystemClock.uptimeMillis(), moreKeysPanel);
+        tracker.onShowMoreKeysPanel(translatedX, translatedY, moreKeysPanel);
         dimEntireKeyboard(true);
         return true;
     }
diff --git a/java/src/com/android/inputmethod/keyboard/PointerTracker.java b/java/src/com/android/inputmethod/keyboard/PointerTracker.java
index 38c419d..d5986aa 100644
--- a/java/src/com/android/inputmethod/keyboard/PointerTracker.java
+++ b/java/src/com/android/inputmethod/keyboard/PointerTracker.java
@@ -18,6 +18,7 @@
 
 import android.content.Context;
 import android.content.res.Resources;
+import android.os.SystemClock;
 import android.util.Log;
 import android.view.MotionEvent;
 import android.widget.TextView;
@@ -615,9 +616,9 @@
         }
     }
 
-    public void onShowMoreKeysPanel(int x, int y, long eventTime, KeyEventHandler handler) {
+    public void onShowMoreKeysPanel(int x, int y, KeyEventHandler handler) {
         onLongPressed();
-        onDownEvent(x, y, eventTime, handler);
+        onDownEvent(x, y, SystemClock.uptimeMillis(), handler);
         mIsShowingMoreKeysPanel = true;
     }
 
diff --git a/java/src/com/android/inputmethod/keyboard/ProximityInfo.java b/java/src/com/android/inputmethod/keyboard/ProximityInfo.java
index 2a25d0c..6c5c3e7 100644
--- a/java/src/com/android/inputmethod/keyboard/ProximityInfo.java
+++ b/java/src/com/android/inputmethod/keyboard/ProximityInfo.java
@@ -75,16 +75,16 @@
         return spellCheckerProximityInfo;
     }
 
-    private int mNativeProximityInfo;
+    private long mNativeProximityInfo;
     static {
         Utils.loadNativeLibrary();
     }
-    private native int setProximityInfoNative(int maxProximityCharsSize, int displayWidth,
+    private native long setProximityInfoNative(int maxProximityCharsSize, int displayWidth,
             int displayHeight, int gridWidth, int gridHeight, int[] proximityCharsArray,
             int keyCount, int[] keyXCoordinates, int[] keyYCoordinates,
             int[] keyWidths, int[] keyHeights, int[] keyCharCodes,
             float[] sweetSpotCenterX, float[] sweetSpotCenterY, float[] sweetSpotRadii);
-    private native void releaseProximityInfoNative(int nativeProximityInfo);
+    private native void releaseProximityInfoNative(long nativeProximityInfo);
 
     private final void setProximityInfo(int[][] gridNeighborKeyIndexes, int keyboardWidth,
             int keyboardHeight, List<Key> keys,
@@ -157,7 +157,7 @@
         }
     }
 
-    public int getNativeProximityInfo() {
+    public long getNativeProximityInfo() {
         return mNativeProximityInfo;
     }
 
diff --git a/java/src/com/android/inputmethod/keyboard/internal/KeyStyles.java b/java/src/com/android/inputmethod/keyboard/internal/KeyStyles.java
index b385b7a..39fb521 100644
--- a/java/src/com/android/inputmethod/keyboard/internal/KeyStyles.java
+++ b/java/src/com/android/inputmethod/keyboard/internal/KeyStyles.java
@@ -235,7 +235,7 @@
         return mStyles.get(styleName);
     }
 
-    public KeyStyle getEmptyKeyStyle() {
+    public static KeyStyle getEmptyKeyStyle() {
         return EMPTY_KEY_STYLE;
     }
 }
diff --git a/java/src/com/android/inputmethod/latin/AutoCorrection.java b/java/src/com/android/inputmethod/latin/AutoCorrection.java
index 485ec51..cd066a3 100644
--- a/java/src/com/android/inputmethod/latin/AutoCorrection.java
+++ b/java/src/com/android/inputmethod/latin/AutoCorrection.java
@@ -98,7 +98,7 @@
         return whiteListedWord != null;
     }
 
-    private boolean hasAutoCorrectionForTypedWord(Map<String, Dictionary> dictionaries,
+    private static boolean hasAutoCorrectionForTypedWord(Map<String, Dictionary> dictionaries,
             WordComposer wordComposer, ArrayList<CharSequence> suggestions, CharSequence typedWord,
             int correctionMode) {
         if (TextUtils.isEmpty(typedWord)) return false;
diff --git a/java/src/com/android/inputmethod/latin/BinaryDictionary.java b/java/src/com/android/inputmethod/latin/BinaryDictionary.java
index b9fd574..f0e56d3 100644
--- a/java/src/com/android/inputmethod/latin/BinaryDictionary.java
+++ b/java/src/com/android/inputmethod/latin/BinaryDictionary.java
@@ -46,7 +46,7 @@
     private static final int TYPED_LETTER_MULTIPLIER = 2;
 
     private int mDicTypeId;
-    private int mNativeDict;
+    private long mNativeDict;
     private final int[] mInputCodes = new int[MAX_WORD_LENGTH * MAX_PROXIMITY_CHARS_SIZE];
     private final char[] mOutputChars = new char[MAX_WORD_LENGTH * MAX_WORDS];
     private final char[] mOutputChars_bigrams = new char[MAX_WORD_LENGTH * MAX_BIGRAMS];
@@ -107,15 +107,15 @@
         Utils.loadNativeLibrary();
     }
 
-    private native int openNative(String sourceDir, long dictOffset, long dictSize,
+    private native long openNative(String sourceDir, long dictOffset, long dictSize,
             int typedLetterMultiplier, int fullWordMultiplier, int maxWordLength,
             int maxWords, int maxAlternatives);
-    private native void closeNative(int dict);
-    private native boolean isValidWordNative(int nativeData, char[] word, int wordLength);
-    private native int getSuggestionsNative(int dict, int proximityInfo, int[] xCoordinates,
+    private native void closeNative(long dict);
+    private native boolean isValidWordNative(long dict, char[] word, int wordLength);
+    private native int getSuggestionsNative(long dict, long proximityInfo, int[] xCoordinates,
             int[] yCoordinates, int[] inputCodes, int codesSize, int flags, char[] outputChars,
             int[] scores);
-    private native int getBigramsNative(int dict, char[] prevWord, int prevWordLength,
+    private native int getBigramsNative(long dict, char[] prevWord, int prevWordLength,
             int[] inputCodes, int inputCodesLength, char[] outputChars, int[] scores,
             int maxWordLength, int maxBigrams, int maxAlternatives);
 
diff --git a/java/src/com/android/inputmethod/latin/LatinIME.java b/java/src/com/android/inputmethod/latin/LatinIME.java
index 40d1bd5..167e500 100644
--- a/java/src/com/android/inputmethod/latin/LatinIME.java
+++ b/java/src/com/android/inputmethod/latin/LatinIME.java
@@ -157,6 +157,22 @@
         SUGGESTION_VISIBILILTY_HIDE_VALUE
     };
 
+    // Magic space: a space that should disappear on space/apostrophe insertion, move after the
+    // punctuation on punctuation insertion, and become a real space on alpha char insertion.
+    // Weak space: a space that should be swapped only by suggestion strip punctuation.
+    // Double space: the state where the user pressed space twice quickly, which LatinIME
+    // resolved as period-space. Undoing this converts the period to a space.
+    // Swap punctuation: the state where a (weak or magic) space and a punctuation from the
+    // suggestion strip have just been swapped. Undoing this swaps them back.
+    private static final int SPACE_STATE_NONE = 0;
+    private static final int SPACE_STATE_DOUBLE = 1;
+    private static final int SPACE_STATE_SWAP_PUNCTUATION = 2;
+    private static final int SPACE_STATE_MAGIC = 3;
+    private static final int SPACE_STATE_WEAK = 4;
+
+    // Current space state of the input method. This can be any of the above constants.
+    private int mSpaceState;
+
     private Settings.Values mSettingsValues;
 
     private View mExtractArea;
@@ -190,12 +206,6 @@
     private WordComposer mWordComposer = new WordComposer();
     private CharSequence mBestWord;
     private boolean mHasUncommittedTypedChars;
-    // Magic space: a space that should disappear on space/apostrophe insertion, move after the
-    // punctuation on punctuation insertion, and become a real space on alpha char insertion.
-    private boolean mJustAddedMagicSpace; // This indicates whether the last char is a magic space.
-    // This indicates whether the last keypress resulted in processing of double space replacement
-    // with period-space.
-    private boolean mJustReplacedDoubleSpace;
 
     private int mCorrectionMode;
     private int mCommittedLength;
@@ -729,8 +739,7 @@
         mComposingStringBuilder.setLength(0);
         mHasUncommittedTypedChars = false;
         mDeleteCount = 0;
-        mJustAddedMagicSpace = false;
-        mJustReplacedDoubleSpace = false;
+        mSpaceState = SPACE_STATE_NONE;
 
         loadSettings();
         updateCorrectionMode();
@@ -753,6 +762,7 @@
                 isSuggestionsStripVisible(), /* needsInputViewShown */ false);
         // Delay updating suggestions because keyboard input view may not be shown at this point.
         mHandler.postUpdateSuggestions();
+        mHandler.cancelDoubleSpacesTimer();
 
         inputView.setKeyPreviewPopupEnabled(mSettingsValues.mKeyPreviewPopupOn,
                 mSettingsValues.mKeyPreviewPopupDismissDelay);
@@ -891,6 +901,13 @@
                 || newSelEnd != candidatesEnd) && mLastSelectionStart != newSelStart;
         final boolean candidatesCleared = candidatesStart == -1 && candidatesEnd == -1;
         if (!mExpectingUpdateSelection) {
+            if (SPACE_STATE_WEAK == mSpaceState) {
+                // Test for no WEAK_SPACE action because there is a race condition that may end up
+                // in coming here on a normal key press. We set this to NONE because after
+                // a cursor move, we don't want the suggestion strip to swap the space with the
+                // newly inserted punctuation.
+                mSpaceState = SPACE_STATE_NONE;
+            }
             if (((mComposingStringBuilder.length() > 0 && mHasUncommittedTypedChars)
                     || mVoiceProxy.isVoiceInputHighlighted())
                     && (selectionChanged || candidatesCleared)) {
@@ -908,8 +925,6 @@
                 TextEntryState.reset();
                 updateSuggestions();
             }
-            mJustAddedMagicSpace = false; // The user moved the cursor.
-            mJustReplacedDoubleSpace = false;
         }
         mExpectingUpdateSelection = false;
         mHandler.postUpdateShiftKeyState();
@@ -1134,25 +1149,22 @@
         return false;
     }
 
-    private void swapSwapperAndSpace() {
-        final InputConnection ic = getCurrentInputConnection();
-        if (ic == null) return;
+    // "ic" may be null
+    private void swapSwapperAndSpaceWhileInBatchEdit(final InputConnection ic) {
+        if (null == ic) return;
         CharSequence lastTwo = ic.getTextBeforeCursor(2, 0);
         // It is guaranteed lastTwo.charAt(1) is a swapper - else this method is not called.
         if (lastTwo != null && lastTwo.length() == 2
                 && lastTwo.charAt(0) == Keyboard.CODE_SPACE) {
-            ic.beginBatchEdit();
             ic.deleteSurroundingText(2, 0);
             ic.commitText(lastTwo.charAt(1) + " ", 1);
-            ic.endBatchEdit();
             mKeyboardSwitcher.updateShiftState();
         }
     }
 
-    private void maybeDoubleSpace() {
-        if (mCorrectionMode == Suggest.CORRECTION_NONE) return;
-        final InputConnection ic = getCurrentInputConnection();
-        if (ic == null) return;
+    private boolean maybeDoubleSpaceWhileInBatchEdit(final InputConnection ic) {
+        if (mCorrectionMode == Suggest.CORRECTION_NONE) return false;
+        if (ic == null) return false;
         final CharSequence lastThree = ic.getTextBeforeCursor(3, 0);
         if (lastThree != null && lastThree.length() == 3
                 && Utils.canBeFollowedByPeriod(lastThree.charAt(0))
@@ -1160,22 +1172,19 @@
                 && lastThree.charAt(2) == Keyboard.CODE_SPACE
                 && mHandler.isAcceptingDoubleSpaces()) {
             mHandler.cancelDoubleSpacesTimer();
-            ic.beginBatchEdit();
             ic.deleteSurroundingText(2, 0);
             ic.commitText(". ", 1);
-            ic.endBatchEdit();
             mKeyboardSwitcher.updateShiftState();
-            mJustReplacedDoubleSpace = true;
-        } else {
-            mHandler.startDoubleSpacesTimer();
+            return true;
         }
+        return false;
     }
 
-    // "ic" must not null
-    private void maybeRemovePreviousPeriod(final InputConnection ic, CharSequence text) {
+    // "ic" must not be null
+    private static void maybeRemovePreviousPeriod(final InputConnection ic, CharSequence text) {
         // When the text's first character is '.', remove the previous period
         // if there is one.
-        CharSequence lastOne = ic.getTextBeforeCursor(1, 0);
+        final CharSequence lastOne = ic.getTextBeforeCursor(1, 0);
         if (lastOne != null && lastOne.length() == 1
                 && lastOne.charAt(0) == Keyboard.CODE_PERIOD
                 && text.charAt(0) == Keyboard.CODE_PERIOD) {
@@ -1183,11 +1192,10 @@
         }
     }
 
-    private void removeTrailingSpace() {
-        final InputConnection ic = getCurrentInputConnection();
+    // "ic" may be null
+    private static void removeTrailingSpaceWhileInBatchEdit(final InputConnection ic) {
         if (ic == null) return;
-
-        CharSequence lastOne = ic.getTextBeforeCursor(1, 0);
+        final CharSequence lastOne = ic.getTextBeforeCursor(1, 0);
         if (lastOne != null && lastOne.length() == 1
                 && lastOne.charAt(0) == Keyboard.CODE_SPACE) {
             ic.deleteSurroundingText(1, 0);
@@ -1203,12 +1211,8 @@
         return true;
     }
 
-    private boolean isAlphabet(int code) {
-        if (Character.isLetter(code)) {
-            return true;
-        } else {
-            return false;
-        }
+    private static boolean isAlphabet(int code) {
+        return Character.isLetter(code);
     }
 
     private void onSettingsKeyPressed() {
@@ -1224,6 +1228,7 @@
 
     // Virtual codes representing custom requests.  These are used in onCustomRequest() below.
     public static final int CODE_SHOW_INPUT_METHOD_PICKER = 1;
+    public static final int CODE_HAPTIC_AND_AUDIO_FEEDBACK = 2;
 
     @Override
     public boolean onCustomRequest(int requestCode) {
@@ -1235,6 +1240,9 @@
                 return true;
             }
             return false;
+        case CODE_HAPTIC_AND_AUDIO_FEEDBACK:
+            hapticAndAudioFeedback(Keyboard.CODE_UNSPECIFIED);
+            return true;
         }
         return false;
     }
@@ -1243,6 +1251,28 @@
         return mOptionsDialog != null && mOptionsDialog.isShowing();
     }
 
+    private void insertPunctuationFromSuggestionStrip(final InputConnection ic, final int code) {
+        final CharSequence beforeText = ic != null ? ic.getTextBeforeCursor(1, 0) : null;
+        final int toLeft = TextUtils.isEmpty(beforeText) ? 0 : beforeText.charAt(0);
+        final boolean shouldRegisterSwapPunctuation;
+        // If we have a space left of the cursor and it's a weak or a magic space, then we should
+        // swap it, and override the space state with SPACESTATE_SWAP_PUNCTUATION.
+        // To swap it, we fool handleSeparator to think the previous space state was a
+        // magic space.
+        if (Keyboard.CODE_SPACE == toLeft && mSpaceState == SPACE_STATE_WEAK) {
+            mSpaceState = SPACE_STATE_MAGIC;
+            shouldRegisterSwapPunctuation = true;
+        } else {
+            shouldRegisterSwapPunctuation = false;
+        }
+        onCodeInput(code, new int[] { code },
+                KeyboardActionListener.NOT_A_TOUCH_COORDINATE,
+                KeyboardActionListener.NOT_A_TOUCH_COORDINATE);
+        if (shouldRegisterSwapPunctuation) {
+            mSpaceState = SPACE_STATE_SWAP_PUNCTUATION;
+        }
+    }
+
     // Implementation of {@link KeyboardActionListener}.
     @Override
     public void onCodeInput(int primaryCode, int[] keyCodes, int x, int y) {
@@ -1253,11 +1283,22 @@
         mLastKeyTime = when;
         KeyboardSwitcher switcher = mKeyboardSwitcher;
         final boolean distinctMultiTouch = switcher.hasDistinctMultitouch();
-        final boolean lastStateOfJustReplacedDoubleSpace = mJustReplacedDoubleSpace;
-        mJustReplacedDoubleSpace = false;
+        // The space state depends only on the last character pressed and its own previous
+        // state. Here, we revert the space state to neutral if the key is actually modifying
+        // the input contents (any non-shift key), which is what we should do for
+        // all inputs that do not result in a special state. Each character handling is then
+        // free to override the state as they see fit.
+        final int spaceState = mSpaceState;
+
+        // TODO: Consolidate the double space timer, mLastKeyTime, and the space state.
+        if (primaryCode != Keyboard.CODE_SPACE) {
+            mHandler.cancelDoubleSpacesTimer();
+        }
+
         switch (primaryCode) {
         case Keyboard.CODE_DELETE:
-            handleBackspace(lastStateOfJustReplacedDoubleSpace);
+            mSpaceState = SPACE_STATE_NONE;
+            handleBackspace(spaceState);
             mDeleteCount++;
             mExpectingUpdateSelection = true;
             LatinImeLogger.logOnDelete();
@@ -1282,11 +1323,7 @@
             break;
         case Keyboard.CODE_CAPSLOCK:
             switcher.toggleCapsLock();
-            //$FALL-THROUGH$
-        case Keyboard.CODE_HAPTIC_AND_AUDIO_FEEDBACK_ONLY:
-            // Dummy code for haptic and audio feedbacks.
-            vibrate();
-            playKeyClick(primaryCode);
+            hapticAndAudioFeedback(primaryCode);
             break;
         case Keyboard.CODE_SHORTCUT:
             mSubtypeSwitcher.switchToShortcutIME();
@@ -1303,10 +1340,11 @@
             // To sum it up: do not update mExpectingUpdateSelection here.
             break;
         default:
+            mSpaceState = SPACE_STATE_NONE;
             if (mSettingsValues.isWordSeparator(primaryCode)) {
-                handleSeparator(primaryCode, x, y);
+                handleSeparator(primaryCode, x, y, spaceState);
             } else {
-                handleCharacter(primaryCode, keyCodes, x, y);
+                handleCharacter(primaryCode, keyCodes, x, y, spaceState);
             }
             mExpectingUpdateSelection = true;
             break;
@@ -1328,7 +1366,7 @@
         ic.endBatchEdit();
         mKeyboardSwitcher.updateShiftState();
         mKeyboardSwitcher.onKey(Keyboard.CODE_DUMMY);
-        mJustAddedMagicSpace = false;
+        mSpaceState = SPACE_STATE_NONE;
         mEnteredText = text;
     }
 
@@ -1338,7 +1376,7 @@
         mKeyboardSwitcher.onCancelInput();
     }
 
-    private void handleBackspace(boolean justReplacedDoubleSpace) {
+    private void handleBackspace(final int spaceState) {
         if (mVoiceProxy.logAndRevertVoiceInput()) return;
 
         final InputConnection ic = getCurrentInputConnection();
@@ -1376,15 +1414,24 @@
         }
         mHandler.postUpdateShiftKeyState();
 
+        // TODO: Merge space state with TextEntryState
         TextEntryState.backspace();
         if (TextEntryState.isUndoCommit()) {
             revertLastWord(ic);
             ic.endBatchEdit();
             return;
         }
-        if (justReplacedDoubleSpace) {
+        if (SPACE_STATE_DOUBLE == spaceState) {
             if (revertDoubleSpace(ic)) {
                 ic.endBatchEdit();
+                // No need to reset mSpaceState, it has already be done (that's why we
+                // receive it as a parameter)
+                return;
+            }
+        } else if (SPACE_STATE_SWAP_PUNCTUATION == spaceState) {
+            if (revertSwapPunctuation(ic)) {
+                ic.endBatchEdit();
+                // Likewise
                 return;
             }
         }
@@ -1434,11 +1481,15 @@
         }
     }
 
-    private void handleCharacter(int primaryCode, int[] keyCodes, int x, int y) {
+    private void handleCharacter(final int primaryCode, final int[] keyCodes, final int x,
+            final int y, final int spaceState) {
         mVoiceProxy.handleCharacter();
 
-        if (mJustAddedMagicSpace && mSettingsValues.isMagicSpaceStripper(primaryCode)) {
-            removeTrailingSpace();
+        final InputConnection ic = getCurrentInputConnection();
+        if (ic != null) ic.beginBatchEdit();
+        if (SPACE_STATE_MAGIC == spaceState
+                && mSettingsValues.isMagicSpaceStripper(primaryCode)) {
+            removeTrailingSpaceWhileInBatchEdit(ic);
         }
 
         int code = primaryCode;
@@ -1456,6 +1507,7 @@
         if (switcher.isShiftedOrShiftLocked()) {
             if (keyCodes == null || keyCodes[0] < Character.MIN_CODE_POINT
                     || keyCodes[0] > Character.MAX_CODE_POINT) {
+                if (null != ic) ic.endBatchEdit();
                 return;
             }
             code = keyCodes[0];
@@ -1469,6 +1521,7 @@
                 } else {
                     // Some keys, such as [eszett], have upper case as multi-characters.
                     onTextInput(upperCaseString);
+                    if (null != ic) ic.endBatchEdit();
                     return;
                 }
             }
@@ -1476,7 +1529,6 @@
         if (mHasUncommittedTypedChars) {
             mComposingStringBuilder.append((char) code);
             mWordComposer.add(code, keyCodes, x, y);
-            final InputConnection ic = getCurrentInputConnection();
             if (ic != null) {
                 // If it's the first letter, make note of auto-caps state
                 if (mWordComposer.size() == 1) {
@@ -1494,18 +1546,19 @@
         } else {
             sendKeyChar((char)code);
         }
-        if (mJustAddedMagicSpace && mSettingsValues.isMagicSpaceSwapper(primaryCode)) {
-            swapSwapperAndSpace();
-        } else {
-            mJustAddedMagicSpace = false;
+        if (SPACE_STATE_MAGIC == spaceState
+                && mSettingsValues.isMagicSpaceSwapper(primaryCode)) {
+            if (null != ic) swapSwapperAndSpaceWhileInBatchEdit(ic);
         }
 
         switcher.updateShiftState();
         if (LatinIME.PERF_DEBUG) measureCps();
         TextEntryState.typedCharacter((char) code, mSettingsValues.isWordSeparator(code), x, y);
+        if (null != ic) ic.endBatchEdit();
     }
 
-    private void handleSeparator(int primaryCode, int x, int y) {
+    private void handleSeparator(final int primaryCode, final int x, final int y,
+            final int spaceState) {
         mVoiceProxy.handleSeparator();
         mComposingStateManager.onFinishComposingText();
 
@@ -1535,21 +1588,49 @@
             }
         }
 
-        if (mJustAddedMagicSpace) {
+        final boolean swapMagicSpace;
+        if (Keyboard.CODE_ENTER == primaryCode && (SPACE_STATE_MAGIC == spaceState
+                || SPACE_STATE_SWAP_PUNCTUATION == spaceState)) {
+            removeTrailingSpaceWhileInBatchEdit(ic);
+            swapMagicSpace = false;
+        } else if (SPACE_STATE_MAGIC == spaceState) {
             if (mSettingsValues.isMagicSpaceSwapper(primaryCode)) {
-                sendKeyChar((char)primaryCode);
-                swapSwapperAndSpace();
+                swapMagicSpace = true;
             } else {
-                if (mSettingsValues.isMagicSpaceStripper(primaryCode)) removeTrailingSpace();
-                sendKeyChar((char)primaryCode);
-                mJustAddedMagicSpace = false;
+                swapMagicSpace = false;
+                if (mSettingsValues.isMagicSpaceStripper(primaryCode)) {
+                    removeTrailingSpaceWhileInBatchEdit(ic);
+                }
             }
         } else {
-            sendKeyChar((char)primaryCode);
+            swapMagicSpace = false;
         }
 
-        if (isSuggestionsRequested() && primaryCode == Keyboard.CODE_SPACE) {
-            maybeDoubleSpace();
+        sendKeyChar((char)primaryCode);
+
+        if (Keyboard.CODE_SPACE == primaryCode) {
+            if (isSuggestionsRequested()) {
+                if (maybeDoubleSpaceWhileInBatchEdit(ic)) {
+                    mSpaceState = SPACE_STATE_DOUBLE;
+                } else if (!isShowingPunctuationList()) {
+                    mSpaceState = SPACE_STATE_WEAK;
+                }
+            }
+
+            mHandler.startDoubleSpacesTimer();
+            if (!isCursorTouchingWord()) {
+                mHandler.cancelUpdateSuggestions();
+                mHandler.postUpdateBigramPredictions();
+            }
+        } else {
+            if (swapMagicSpace) {
+                swapSwapperAndSpaceWhileInBatchEdit(ic);
+                mSpaceState = SPACE_STATE_MAGIC;
+            }
+
+            // Set punctuation right away. onUpdateSelection will fire but tests whether it is
+            // already displayed or not, so it's okay.
+            setPunctuationSuggestions();
         }
 
         TextEntryState.typedCharacter((char) primaryCode, true, x, y);
@@ -1562,16 +1643,6 @@
                         ic, mLastSelectionEnd - typedWord.length(), typedWord, mBestWord);
             }
         }
-        if (Keyboard.CODE_SPACE == primaryCode) {
-            if (!isCursorTouchingWord()) {
-                mHandler.cancelUpdateSuggestions();
-                mHandler.postUpdateBigramPredictions();
-            }
-        } else {
-            // Set punctuation right away. onUpdateSelection will fire but tests whether it is
-            // already displayed or not, so it's okay.
-            setPunctuationSuggestions();
-        }
         mKeyboardSwitcher.updateShiftState();
         if (ic != null) {
             ic.endBatchEdit();
@@ -1606,7 +1677,7 @@
     public boolean isSuggestionsStripVisible() {
         if (mSuggestionsView == null)
             return false;
-        if (mSuggestionsView.isShowingAddToDictionaryHint() || TextEntryState.isRecorrecting())
+        if (mSuggestionsView.isShowingAddToDictionaryHint())
             return true;
         if (!isShowingSuggestionsStrip())
             return false;
@@ -1711,7 +1782,6 @@
         }
         // Don't auto-correct words with multiple capital letter
         autoCorrectionAvailable &= !wordComposer.isMostlyCaps();
-        autoCorrectionAvailable &= !TextEntryState.isRecorrecting();
 
         // Basically, we update the suggestion strip only when suggestion count > 1.  However,
         // there is an exception: We update the suggestion strip whenever typed word's length
@@ -1784,7 +1854,6 @@
         mVoiceProxy.flushAndLogAllTextModificationCounters(index, suggestion,
                 mSettingsValues.mWordSeparators);
 
-        final boolean recorrecting = TextEntryState.isRecorrecting();
         final InputConnection ic = getCurrentInputConnection();
         if (ic != null) {
             ic.beginBatchEdit();
@@ -1814,8 +1883,8 @@
             LatinImeLogger.logOnManualSuggestion(
                     "", suggestion.toString(), index, suggestions.mWords);
             // Find out whether the previous character is a space. If it is, as a special case
-            // for punctuation entered through the suggestion strip, it should be considered
-            // a magic space even if it was a normal space. This is meant to help in case the user
+            // for punctuation entered through the suggestion strip, it should be swapped
+            // if it was a magic or a weak space. This is meant to help in case the user
             // pressed space on purpose of displaying the suggestion strip punctuation.
             final int rawPrimaryCode = suggestion.charAt(0);
             // Maybe apply the "bidi mirrored" conversions for parentheses
@@ -1823,15 +1892,8 @@
             final boolean isRtl = keyboard != null && keyboard.mIsRtlKeyboard;
             final int primaryCode = Key.getRtlParenthesisCode(rawPrimaryCode, isRtl);
 
-            final CharSequence beforeText = ic != null ? ic.getTextBeforeCursor(1, 0) : "";
-            final int toLeft = (ic == null || TextUtils.isEmpty(beforeText))
-                    ? 0 : beforeText.charAt(0);
-            final boolean oldMagicSpace = mJustAddedMagicSpace;
-            if (Keyboard.CODE_SPACE == toLeft) mJustAddedMagicSpace = true;
-            onCodeInput(primaryCode, new int[] { primaryCode },
-                    KeyboardActionListener.NOT_A_TOUCH_COORDINATE,
-                    KeyboardActionListener.NOT_A_TOUCH_COORDINATE);
-            mJustAddedMagicSpace = oldMagicSpace;
+            insertPunctuationFromSuggestionStrip(ic, primaryCode);
+            // TODO: the following endBatchEdit seems useless, check
             if (ic != null) {
                 ic.endBatchEdit();
             }
@@ -1855,7 +1917,7 @@
                 suggestion.toString(), index, suggestions.mWords);
         TextEntryState.acceptedSuggestion(mComposingStringBuilder.toString(), suggestion);
         // Follow it with a space
-        if (mInsertSpaceOnPickSuggestionManually && !recorrecting) {
+        if (mInsertSpaceOnPickSuggestionManually) {
             sendMagicSpace();
         }
 
@@ -1875,13 +1937,11 @@
                         || !AutoCorrection.isValidWord(
                                 mSuggest.getUnigramDictionaries(), suggestion, true));
 
-        if (!recorrecting) {
-            // Fool the state watcher so that a subsequent backspace will not do a revert, unless
-            // we just did a correction, in which case we need to stay in
-            // TextEntryState.State.PICKED_SUGGESTION state.
-            TextEntryState.typedCharacter((char) Keyboard.CODE_SPACE, true,
-                    WordComposer.NOT_A_COORDINATE, WordComposer.NOT_A_COORDINATE);
-        }
+        // Fool the state watcher so that a subsequent backspace will not do a revert, unless
+        // we just did a correction, in which case we need to stay in
+        // TextEntryState.State.PICKED_SUGGESTION state.
+        TextEntryState.typedCharacter((char) Keyboard.CODE_SPACE, true,
+                WordComposer.NOT_A_COORDINATE, WordComposer.NOT_A_COORDINATE);
         if (!showingAddToDictionaryHint) {
             // If we're not showing the "Touch again to save", then show corrections again.
             // In case the cursor position doesn't change, make sure we show the suggestions again.
@@ -1892,7 +1952,8 @@
         }
         if (showingAddToDictionaryHint) {
             if (mIsUserDictionaryAvaliable) {
-                mSuggestionsView.showAddToDictionaryHint(suggestion);
+                mSuggestionsView.showAddToDictionaryHint(
+                        suggestion, mSettingsValues.mHintToSaveText);
             } else {
                 mHandler.postUpdateSuggestions();
             }
@@ -2023,13 +2084,13 @@
         return false;
     }
 
-    // "ic" must not null
-    private boolean sameAsTextBeforeCursor(final InputConnection ic, CharSequence text) {
+    // "ic" must not be null
+    private static boolean sameAsTextBeforeCursor(final InputConnection ic, CharSequence text) {
         CharSequence beforeText = ic.getTextBeforeCursor(text.length(), 0);
         return TextUtils.equals(text, beforeText);
     }
 
-    // "ic" must not null
+    // "ic" must not be null
     private void revertLastWord(final InputConnection ic) {
         if (mHasUncommittedTypedChars || mComposingStringBuilder.length() <= 0) {
             sendDownUpKeyEvents(KeyEvent.KEYCODE_DEL);
@@ -2063,7 +2124,7 @@
         mHandler.postUpdateSuggestions();
     }
 
-    // "ic" must not null
+    // "ic" must not be null
     private boolean revertDoubleSpace(final InputConnection ic) {
         mHandler.cancelDoubleSpacesTimer();
         // Here we test whether we indeed have a period and a space before us. This should not
@@ -2078,13 +2139,28 @@
         return true;
     }
 
+    private static boolean revertSwapPunctuation(final InputConnection ic) {
+        // Here we test whether we indeed have a space and something else before us. This should not
+        // be needed, but it's there just in case something went wrong.
+        final CharSequence textBeforeCursor = ic.getTextBeforeCursor(2, 0);
+        // NOTE: This does not work with surrogate pairs. Hopefully when the keyboard is able to
+        // enter surrogate pairs this code will have been removed.
+        if (Keyboard.CODE_SPACE != textBeforeCursor.charAt(1))
+            return false;
+        ic.beginBatchEdit();
+        ic.deleteSurroundingText(2, 0);
+        ic.commitText(" " + textBeforeCursor.subSequence(0, 1), 1);
+        ic.endBatchEdit();
+        return true;
+    }
+
     public boolean isWordSeparator(int code) {
         return mSettingsValues.isWordSeparator(code);
     }
 
     private void sendMagicSpace() {
         sendKeyChar((char)Keyboard.CODE_SPACE);
-        mJustAddedMagicSpace = true;
+        mSpaceState = SPACE_STATE_MAGIC;
         mKeyboardSwitcher.updateShiftState();
     }
 
@@ -2110,12 +2186,16 @@
         loadSettings();
     }
 
+    private void hapticAndAudioFeedback(int primaryCode) {
+        vibrate();
+        playKeyClick(primaryCode);
+    }
+
     @Override
     public void onPress(int primaryCode, boolean withSliding) {
         final KeyboardSwitcher switcher = mKeyboardSwitcher;
         if (switcher.isVibrateAndSoundFeedbackRequired()) {
-            vibrate();
-            playKeyClick(primaryCode);
+            hapticAndAudioFeedback(primaryCode);
         }
         final boolean distinctMultiTouch = switcher.hasDistinctMultitouch();
         if (distinctMultiTouch && primaryCode == Keyboard.CODE_SHIFT) {
diff --git a/java/src/com/android/inputmethod/latin/Settings.java b/java/src/com/android/inputmethod/latin/Settings.java
index eeb0299..9d5d890 100644
--- a/java/src/com/android/inputmethod/latin/Settings.java
+++ b/java/src/com/android/inputmethod/latin/Settings.java
@@ -115,6 +115,7 @@
         public final String mSuggestPuncs;
         public final SuggestedWords mSuggestPuncList;
         private final String mSymbolsExcludedFromWordSeparators;
+        public final CharSequence mHintToSaveText;
 
         // From preferences:
         public final boolean mSoundOn; // Sound setting private to Latin IME (see mSilentModeOn)
@@ -176,6 +177,7 @@
             mSuggestPuncs = res.getString(R.string.suggested_punctuations);
             // TODO: it would be nice not to recreate this each time we change the configuration
             mSuggestPuncList = createSuggestPuncList(mSuggestPuncs);
+            mHintToSaveText = context.getText(R.string.hint_add_to_dictionary);
 
             // Get the settings preferences
             final boolean hasVibrator = VibratorCompatWrapper.getInstance(context).hasVibrator();
@@ -792,4 +794,4 @@
         builder.setView(v);
         builder.create().show();
     }
-}
\ No newline at end of file
+}
diff --git a/java/src/com/android/inputmethod/latin/Suggest.java b/java/src/com/android/inputmethod/latin/Suggest.java
index caa5aac..97e9174 100644
--- a/java/src/com/android/inputmethod/latin/Suggest.java
+++ b/java/src/com/android/inputmethod/latin/Suggest.java
@@ -144,7 +144,7 @@
         initWhitelistAndAutocorrectAndPool(context, locale);
     }
 
-    private void addOrReplaceDictionary(Map<String, Dictionary> dictionaries, String key,
+    private static void addOrReplaceDictionary(Map<String, Dictionary> dictionaries, String key,
             Dictionary dict) {
         final Dictionary oldDict = (dict == null)
                 ? dictionaries.remove(key)
@@ -518,7 +518,8 @@
         return -1;
     }
 
-    private void collectGarbage(ArrayList<CharSequence> suggestions, int prefMaxSuggestions) {
+    private static void collectGarbage(ArrayList<CharSequence> suggestions,
+            int prefMaxSuggestions) {
         int poolSize = StringBuilderPool.getSize();
         int garbageSize = suggestions.size();
         while (poolSize < prefMaxSuggestions && garbageSize > 0) {
diff --git a/java/src/com/android/inputmethod/latin/SuggestionsView.java b/java/src/com/android/inputmethod/latin/SuggestionsView.java
index c25ecb3..8c49ba0 100644
--- a/java/src/com/android/inputmethod/latin/SuggestionsView.java
+++ b/java/src/com/android/inputmethod/latin/SuggestionsView.java
@@ -30,7 +30,6 @@
 import android.graphics.drawable.ColorDrawable;
 import android.graphics.drawable.Drawable;
 import android.os.Message;
-import android.os.SystemClock;
 import android.text.Spannable;
 import android.text.SpannableString;
 import android.text.Spanned;
@@ -172,7 +171,6 @@
 
         public final TextView mWordToSaveView;
         private final TextView mHintToSaveView;
-        private final CharSequence mHintToSaveText;
 
         public SuggestionsViewParams(Context context, AttributeSet attrs, int defStyle,
                 List<TextView> words, List<View> dividers, List<TextView> infos) {
@@ -228,7 +226,6 @@
             final LayoutInflater inflater = LayoutInflater.from(context);
             mWordToSaveView = (TextView)inflater.inflate(R.layout.suggestion_word, null);
             mHintToSaveView = (TextView)inflater.inflate(R.layout.suggestion_word, null);
-            mHintToSaveText = context.getText(R.string.hint_add_to_dictionary);
         }
 
         private static Drawable getMoreSuggestionsHint(Resources res, float textSize, int color) {
@@ -445,7 +442,7 @@
         }
 
         public void layoutAddToDictionaryHint(CharSequence word, ViewGroup stripView,
-                int stripWidth) {
+                int stripWidth, CharSequence hintText) {
             final int width = stripWidth - mDividerWidth - mPadding * 2;
 
             final TextView wordView = mWordToSaveView;
@@ -464,8 +461,8 @@
             final TextView hintView = mHintToSaveView;
             hintView.setTextColor(mColorAutoCorrect);
             final int hintWidth = width - wordWidth;
-            final float hintScaleX = getTextScaleX(mHintToSaveText, hintWidth, hintView.getPaint());
-            hintView.setText(mHintToSaveText);
+            final float hintScaleX = getTextScaleX(hintText, hintWidth, hintView.getPaint());
+            hintView.setText(hintText);
             hintView.setTextScaleX(hintScaleX);
             stripView.addView(hintView);
             setLayoutWeight(
@@ -647,9 +644,9 @@
                 && mSuggestionsStrip.getChildAt(0) == mParams.mWordToSaveView;
     }
 
-    public void showAddToDictionaryHint(CharSequence word) {
+    public void showAddToDictionaryHint(CharSequence word, CharSequence hintText) {
         clear();
-        mParams.layoutAddToDictionaryHint(word, mSuggestionsStrip, getWidth());
+        mParams.layoutAddToDictionaryHint(word, mSuggestionsStrip, getWidth(), hintText);
     }
 
     public boolean dismissAddToDictionaryHint() {
@@ -832,8 +829,7 @@
                 // Decided to be in the sliding input mode only when the touch point has been moved
                 // upward.
                 mMoreSuggestionsMode = MORE_SUGGESTIONS_IN_SLIDING_MODE;
-                tracker.onShowMoreKeysPanel(
-                        translatedX, translatedY, SystemClock.uptimeMillis(), moreKeysPanel);
+                tracker.onShowMoreKeysPanel(translatedX, translatedY, moreKeysPanel);
             } else if (action == MotionEvent.ACTION_UP || action == MotionEvent.ACTION_POINTER_UP) {
                 // Decided to be in the modal input mode
                 mMoreSuggestionsMode = MORE_SUGGESTIONS_IN_MODAL_MODE;
diff --git a/java/src/com/android/inputmethod/latin/TextEntryState.java b/java/src/com/android/inputmethod/latin/TextEntryState.java
index 79b3bde..82242f8 100644
--- a/java/src/com/android/inputmethod/latin/TextEntryState.java
+++ b/java/src/com/android/inputmethod/latin/TextEntryState.java
@@ -30,13 +30,10 @@
     private static final int IN_WORD = 2;
     private static final int ACCEPTED_DEFAULT = 3;
     private static final int PICKED_SUGGESTION = 4;
-    private static final int PUNCTUATION_AFTER_WORD = 5;
-    private static final int PUNCTUATION_AFTER_ACCEPTED = 6;
-    private static final int SPACE_AFTER_ACCEPTED = 7;
-    private static final int SPACE_AFTER_PICKED = 8;
-    private static final int UNDO_COMMIT = 9;
-    private static final int RECORRECTING = 10;
-    private static final int PICKED_RECORRECTION = 11;
+    private static final int PUNCTUATION_AFTER_ACCEPTED = 5;
+    private static final int SPACE_AFTER_ACCEPTED = 6;
+    private static final int SPACE_AFTER_PICKED = 7;
+    private static final int UNDO_COMMIT = 8;
 
     private static int sState = UNKNOWN;
     private static int sPreviousState = UNKNOWN;
@@ -79,27 +76,11 @@
     }
 
     public static void acceptedSuggestion(CharSequence typedWord, CharSequence actualWord) {
-        if (sState == RECORRECTING || sState == PICKED_RECORRECTION) {
-            setState(PICKED_RECORRECTION);
-        } else {
-            setState(PICKED_SUGGESTION);
-        }
+        setState(PICKED_SUGGESTION);
         if (DEBUG)
             displayState("acceptedSuggestion", "typedWord", typedWord, "actualWord", actualWord);
     }
 
-    public static void selectedForRecorrection() {
-        setState(RECORRECTING);
-        if (DEBUG) displayState("selectedForRecorrection");
-    }
-
-    public static void onAbortRecorrection() {
-        if (sState == RECORRECTING || sState == PICKED_RECORRECTION) {
-            setState(START);
-        }
-        if (DEBUG) displayState("onAbortRecorrection");
-    }
-
     public static void typedCharacter(char c, boolean isSeparator, int x, int y) {
         final boolean isSpace = (c == Keyboard.CODE_SPACE);
         switch (sState) {
@@ -123,7 +104,6 @@
             }
             break;
         case PICKED_SUGGESTION:
-        case PICKED_RECORRECTION:
             if (isSpace) {
                 setState(SPACE_AFTER_PICKED);
             } else if (isSeparator) {
@@ -136,7 +116,6 @@
         case START:
         case UNKNOWN:
         case SPACE_AFTER_ACCEPTED:
-        case PUNCTUATION_AFTER_WORD:
             if (!isSpace && !isSeparator) {
                 setState(IN_WORD);
             } else {
@@ -150,9 +129,6 @@
                 setState(IN_WORD);
             }
             break;
-        case RECORRECTING:
-            setState(START);
-            break;
         }
         RingCharBuffer.getInstance().push(c, x, y);
         if (isSeparator) {
@@ -178,26 +154,10 @@
         if (DEBUG) displayState("reset");
     }
 
-    public static boolean isAcceptedDefault() {
-        return sState == ACCEPTED_DEFAULT;
-    }
-
-    public static boolean isSpaceAfterPicked() {
-        return sState == SPACE_AFTER_PICKED;
-    }
-
     public static boolean isUndoCommit() {
         return sState == UNDO_COMMIT;
     }
 
-    public static boolean isPunctuationAfterAccepted() {
-        return sState == PUNCTUATION_AFTER_ACCEPTED;
-    }
-
-    public static boolean isRecorrecting() {
-        return sState == RECORRECTING || sState == PICKED_RECORRECTION;
-    }
-
     public static String getState() {
         return stateName(sState);
     }
@@ -208,13 +168,10 @@
         case IN_WORD: return "IN_WORD";
         case ACCEPTED_DEFAULT: return "ACCEPTED_DEFAULT";
         case PICKED_SUGGESTION: return "PICKED_SUGGESTION";
-        case PUNCTUATION_AFTER_WORD: return "PUNCTUATION_AFTER_WORD";
         case PUNCTUATION_AFTER_ACCEPTED: return "PUNCTUATION_AFTER_ACCEPTED";
         case SPACE_AFTER_ACCEPTED: return "SPACE_AFTER_ACCEPTED";
         case SPACE_AFTER_PICKED: return "SPACE_AFTER_PICKED";
         case UNDO_COMMIT: return "UNDO_COMMIT";
-        case RECORRECTING: return "RECORRECTING";
-        case PICKED_RECORRECTION: return "PICKED_RECORRECTION";
         default: return "UNKNOWN";
         }
     }
diff --git a/java/src/com/android/inputmethod/latin/UserBigramDictionary.java b/java/src/com/android/inputmethod/latin/UserBigramDictionary.java
index 9e65667..3a1af93 100644
--- a/java/src/com/android/inputmethod/latin/UserBigramDictionary.java
+++ b/java/src/com/android/inputmethod/latin/UserBigramDictionary.java
@@ -238,7 +238,7 @@
     /**
      * Query the database
      */
-    private Cursor query(String selection, String[] selectionArgs) {
+    private static Cursor query(String selection, String[] selectionArgs) {
         SQLiteQueryBuilder qb = new SQLiteQueryBuilder();
 
         // main INNER JOIN frequency ON (main._id=freq.pair_id)
@@ -310,7 +310,7 @@
         }
 
         /** Prune any old data if the database is getting too big. */
-        private void checkPruneData(SQLiteDatabase db) {
+        private static void checkPruneData(SQLiteDatabase db) {
             db.execSQL("PRAGMA foreign_keys = ON;");
             Cursor c = db.query(FREQ_TABLE_NAME, new String[] { FREQ_COLUMN_PAIR_ID },
                     null, null, null, null, null);
@@ -380,7 +380,7 @@
             return null;
         }
 
-        private ContentValues getContentValues(String word1, String word2, String locale) {
+        private static ContentValues getContentValues(String word1, String word2, String locale) {
             ContentValues values = new ContentValues(3);
             values.put(MAIN_COLUMN_WORD1, word1);
             values.put(MAIN_COLUMN_WORD2, word2);
@@ -388,7 +388,7 @@
             return values;
         }
 
-        private ContentValues getFrequencyContentValues(int pairId, int frequency) {
+        private static ContentValues getFrequencyContentValues(int pairId, int frequency) {
            ContentValues values = new ContentValues(2);
            values.put(FREQ_COLUMN_PAIR_ID, pairId);
            values.put(FREQ_COLUMN_FREQUENCY, frequency);
diff --git a/java/src/com/android/inputmethod/latin/UserUnigramDictionary.java b/java/src/com/android/inputmethod/latin/UserUnigramDictionary.java
index e41230b..de7cb57 100644
--- a/java/src/com/android/inputmethod/latin/UserUnigramDictionary.java
+++ b/java/src/com/android/inputmethod/latin/UserUnigramDictionary.java
@@ -206,7 +206,7 @@
         }
     }
 
-    private Cursor query(String selection, String[] selectionArgs) {
+    private static Cursor query(String selection, String[] selectionArgs) {
         SQLiteQueryBuilder qb = new SQLiteQueryBuilder();
         qb.setTables(USER_UNIGRAM_DICT_TABLE_NAME);
         qb.setProjectionMap(sDictProjectionMap);
@@ -251,7 +251,7 @@
             return null;
         }
 
-        private ContentValues getContentValues(String word, int frequency, String locale) {
+        private static ContentValues getContentValues(String word, int frequency, String locale) {
             ContentValues values = new ContentValues(4);
             values.put(COLUMN_WORD, word);
             values.put(COLUMN_FREQUENCY, frequency);
diff --git a/java/src/com/android/inputmethod/latin/Utils.java b/java/src/com/android/inputmethod/latin/Utils.java
index b29ff19..3d0aa09 100644
--- a/java/src/com/android/inputmethod/latin/Utils.java
+++ b/java/src/com/android/inputmethod/latin/Utils.java
@@ -242,7 +242,7 @@
             UsabilityStudyLogUtils.getInstance().init(context);
             return sRingCharBuffer;
         }
-        private int normalize(int in) {
+        private static int normalize(int in) {
             int ret = in % BUFSIZE;
             return ret < 0 ? ret + BUFSIZE : ret;
         }
@@ -465,7 +465,7 @@
             }
         }
 
-        public void writeBackSpace() {
+        public static void writeBackSpace() {
             UsabilityStudyLogUtils.getInstance().write("<backspace>\t0\t0");
         }
 
diff --git a/java/src/com/android/inputmethod/latin/WordComposer.java b/java/src/com/android/inputmethod/latin/WordComposer.java
index adc5637..7f3a542 100644
--- a/java/src/com/android/inputmethod/latin/WordComposer.java
+++ b/java/src/com/android/inputmethod/latin/WordComposer.java
@@ -135,7 +135,7 @@
      * @param primaryCode the preferred character
      * @param codes array of codes based on distance from touch point
      */
-    private void correctPrimaryJuxtapos(int primaryCode, int[] codes) {
+    private static void correctPrimaryJuxtapos(int primaryCode, int[] codes) {
         if (codes.length < 2) return;
         if (codes[0] > 0 && codes[1] > 0 && codes[0] != primaryCode && codes[1] == primaryCode) {
             codes[1] = codes[0];
diff --git a/java/src/com/android/inputmethod/latin/spellcheck/AndroidSpellCheckerService.java b/java/src/com/android/inputmethod/latin/spellcheck/AndroidSpellCheckerService.java
index 095c2c5..93540ab 100644
--- a/java/src/com/android/inputmethod/latin/spellcheck/AndroidSpellCheckerService.java
+++ b/java/src/com/android/inputmethod/latin/spellcheck/AndroidSpellCheckerService.java
@@ -82,15 +82,15 @@
 
     // The threshold for a candidate to be offered as a suggestion.
     private double mSuggestionThreshold;
-    // The threshold for a suggestion to be considered "likely".
-    private double mLikelyThreshold;
+    // The threshold for a suggestion to be considered "recommended".
+    private double mRecommendedThreshold;
 
     @Override public void onCreate() {
         super.onCreate();
         mSuggestionThreshold =
                 Double.parseDouble(getString(R.string.spellchecker_suggestion_threshold_value));
-        mLikelyThreshold =
-                Double.parseDouble(getString(R.string.spellchecker_likely_threshold_value));
+        mRecommendedThreshold =
+                Double.parseDouble(getString(R.string.spellchecker_recommended_threshold_value));
     }
 
     @Override
@@ -110,10 +110,11 @@
     private static class SuggestionsGatherer implements WordCallback {
         public static class Result {
             public final String[] mSuggestions;
-            public final boolean mHasLikelySuggestions;
-            public Result(final String[] gatheredSuggestions, final boolean hasLikelySuggestions) {
+            public final boolean mHasRecommendedSuggestions;
+            public Result(final String[] gatheredSuggestions,
+                    final boolean hasRecommendedSuggestions) {
                 mSuggestions = gatheredSuggestions;
-                mHasLikelySuggestions = hasLikelySuggestions;
+                mHasRecommendedSuggestions = hasRecommendedSuggestions;
             }
         }
 
@@ -121,7 +122,7 @@
         private final int[] mScores;
         private final String mOriginalText;
         private final double mSuggestionThreshold;
-        private final double mLikelyThreshold;
+        private final double mRecommendedThreshold;
         private final int mMaxLength;
         private int mLength = 0;
 
@@ -131,10 +132,10 @@
         private int mBestScore = Integer.MIN_VALUE; // As small as possible
 
         SuggestionsGatherer(final String originalText, final double suggestionThreshold,
-                final double likelyThreshold, final int maxLength) {
+                final double recommendedThreshold, final int maxLength) {
             mOriginalText = originalText;
             mSuggestionThreshold = suggestionThreshold;
-            mLikelyThreshold = likelyThreshold;
+            mRecommendedThreshold = recommendedThreshold;
             mMaxLength = maxLength;
             mSuggestions = new ArrayList<CharSequence>(maxLength + 1);
             mScores = new int[mMaxLength];
@@ -198,19 +199,19 @@
 
         public Result getResults(final int capitalizeType, final Locale locale) {
             final String[] gatheredSuggestions;
-            final boolean hasLikelySuggestions;
+            final boolean hasRecommendedSuggestions;
             if (0 == mLength) {
                 // Either we found no suggestions, or we found some BUT the max length was 0.
                 // If we found some mBestSuggestion will not be null. If it is null, then
                 // we found none, regardless of the max length.
                 if (null == mBestSuggestion) {
                     gatheredSuggestions = null;
-                    hasLikelySuggestions = false;
+                    hasRecommendedSuggestions = false;
                 } else {
                     gatheredSuggestions = EMPTY_STRING_ARRAY;
                     final double normalizedScore =
                             Utils.calcNormalizedScore(mOriginalText, mBestSuggestion, mBestScore);
-                    hasLikelySuggestions = (normalizedScore > mLikelyThreshold);
+                    hasRecommendedSuggestions = (normalizedScore > mRecommendedThreshold);
                 }
             } else {
                 if (DBG) {
@@ -244,15 +245,15 @@
                 final CharSequence bestSuggestion = mSuggestions.get(0);
                 final double normalizedScore =
                         Utils.calcNormalizedScore(mOriginalText, bestSuggestion, bestScore);
-                hasLikelySuggestions = (normalizedScore > mLikelyThreshold);
+                hasRecommendedSuggestions = (normalizedScore > mRecommendedThreshold);
                 if (DBG) {
                     Log.i(TAG, "Best suggestion : " + bestSuggestion + ", score " + bestScore);
                     Log.i(TAG, "Normalized score = " + normalizedScore
-                            + " (threshold " + mLikelyThreshold
-                            + ") => hasLikelySuggestions = " + hasLikelySuggestions);
+                            + " (threshold " + mRecommendedThreshold
+                            + ") => hasRecommendedSuggestions = " + hasRecommendedSuggestions);
                 }
             }
-            return new Result(gatheredSuggestions, hasLikelySuggestions);
+            return new Result(gatheredSuggestions, hasRecommendedSuggestions);
         }
     }
 
@@ -360,6 +361,27 @@
             mLocale = LocaleUtils.constructLocaleFromString(localeString);
         }
 
+        /*
+         * Returns whether the code point is a letter that makes sense for the specified
+         * locale for this spell checker.
+         * The dictionaries supported by Latin IME are described in res/xml/spellchecker.xml
+         * and is limited to EFIGS language.
+         * Hence at the moment this explicitly excludes non-Latin scripts, including CJK
+         * characters, but also Cyrillic, Arabic or Hebrew characters.
+         * The locale should be used to rule out inappropriate characters when we support
+         * spellchecking other languages like Russian.
+         */
+        private static boolean isLetterCheckableByLanguage(final int codePoint,
+                final Locale locale) {
+            // Our supported dictionaries (EFIGS) at the moment only includes characters
+            // in the C0, C1, Latin Extended A and B, IPA extensions unicode blocks.
+            // As it happens, those are back-to-back in the code range 0x40 to 0x2AF, so
+            // the below is a very efficient way to test for it. As for the 0-0x3F, it's
+            // excluded from isLetter anyway.
+            // TODO: change this to use locale when we support other scripts
+            return codePoint <= 0x2AF && Character.isLetter(codePoint);
+        }
+
         /**
          * Finds out whether a particular string should be filtered out of spell checking.
          *
@@ -368,7 +390,7 @@
          * @param text the string to evaluate.
          * @return true if we should filter this text out, false otherwise
          */
-        private boolean shouldFilterOut(final String text) {
+        private static boolean shouldFilterOut(final String text, final Locale locale) {
             if (TextUtils.isEmpty(text) || text.length() <= 1) return true;
 
             // TODO: check if an equivalent processing can't be done more quickly with a
@@ -376,7 +398,7 @@
             // Filter by first letter
             final int firstCodePoint = text.codePointAt(0);
             // Filter out words that don't start with a letter or an apostrophe
-            if (!Character.isLetter(firstCodePoint)
+            if (!isLetterCheckableByLanguage(firstCodePoint, locale)
                     && '\'' != firstCodePoint) return true;
 
             // Filter contents
@@ -389,7 +411,7 @@
                 // words or a URI - in either case we don't want to spell check that
                 if ('@' == codePoint
                         || '/' == codePoint) return true;
-                if (Character.isLetter(codePoint)) ++letterCount;
+                if (isLetterCheckableByLanguage(codePoint, locale)) ++letterCount;
             }
             // Guestimate heuristic: perform spell checking if at least 3/4 of the characters
             // in this word are letters
@@ -408,7 +430,7 @@
             try {
                 final String text = textInfo.getText();
 
-                if (shouldFilterOut(text)) {
+                if (shouldFilterOut(text, mLocale)) {
                     DictAndProximity dictInfo = null;
                     try {
                         dictInfo = mDictionaryPool.takeOrGetNull();
@@ -426,7 +448,8 @@
 
                 // TODO: Don't gather suggestions if the limit is <= 0 unless necessary
                 final SuggestionsGatherer suggestionsGatherer = new SuggestionsGatherer(text,
-                        mService.mSuggestionThreshold, mService.mLikelyThreshold, suggestionsLimit);
+                        mService.mSuggestionThreshold, mService.mRecommendedThreshold,
+                        suggestionsLimit);
                 final WordComposer composer = new WordComposer();
                 final int length = text.length();
                 for (int i = 0; i < length; ++i) {
@@ -475,7 +498,7 @@
                             + suggestionsLimit);
                     Log.i(TAG, "IsInDict = " + isInDict);
                     Log.i(TAG, "LooksLikeTypo = " + (!isInDict));
-                    Log.i(TAG, "HasLikelySuggestions = " + result.mHasLikelySuggestions);
+                    Log.i(TAG, "HasRecommendedSuggestions = " + result.mHasRecommendedSuggestions);
                     if (null != result.mSuggestions) {
                         for (String suggestion : result.mSuggestions) {
                             Log.i(TAG, suggestion);
@@ -483,10 +506,12 @@
                     }
                 }
 
-                // TODO: actually use result.mHasLikelySuggestions
                 final int flags =
                         (isInDict ? SuggestionsInfo.RESULT_ATTR_IN_THE_DICTIONARY
-                                : SuggestionsInfo.RESULT_ATTR_LOOKS_LIKE_TYPO);
+                                : SuggestionsInfo.RESULT_ATTR_LOOKS_LIKE_TYPO)
+                        | (result.mHasRecommendedSuggestions
+                                ? SuggestionsInfo.RESULT_ATTR_HAS_RECOMMENDED_SUGGESTIONS
+                                : 0);
                 return new SuggestionsInfo(flags, result.mSuggestions);
             } catch (RuntimeException e) {
                 // Don't kill the keyboard if there is a bug in the spell checker
diff --git a/native/Android.mk b/native/Android.mk
index f07be6a..d2537f0 100644
--- a/native/Android.mk
+++ b/native/Android.mk
@@ -12,6 +12,7 @@
     jni/com_android_inputmethod_keyboard_ProximityInfo.cpp \
     jni/com_android_inputmethod_latin_BinaryDictionary.cpp \
     jni/jni_common.cpp \
+    src/basechars.cpp \
     src/bigram_dictionary.cpp \
     src/char_utils.cpp \
     src/correction.cpp \
diff --git a/native/jni/com_android_inputmethod_keyboard_ProximityInfo.cpp b/native/jni/com_android_inputmethod_keyboard_ProximityInfo.cpp
index 595ea2f..6e4fefd 100644
--- a/native/jni/com_android_inputmethod_keyboard_ProximityInfo.cpp
+++ b/native/jni/com_android_inputmethod_keyboard_ProximityInfo.cpp
@@ -28,14 +28,14 @@
 
 namespace latinime {
 
-static jint latinime_Keyboard_setProximityInfo(JNIEnv *env, jobject object,
+static jlong latinime_Keyboard_setProximityInfo(JNIEnv *env, jobject object,
         jint maxProximityCharsSize, jint displayWidth, jint displayHeight, jint gridWidth,
         jint gridHeight, jintArray proximityCharsArray, jint keyCount,
         jintArray keyXCoordinateArray, jintArray keyYCoordinateArray, jintArray keyWidthArray,
         jintArray keyHeightArray, jintArray keyCharCodeArray,
         jfloatArray sweetSpotCenterXArray, jfloatArray sweetSpotCenterYArray,
         jfloatArray sweetSpotRadiusArray) {
-    jint *proximityChars = env->GetIntArrayElements(proximityCharsArray, NULL);
+    jint *proximityChars = env->GetIntArrayElements(proximityCharsArray, 0);
     jint *keyXCoordinates = safeGetIntArrayElements(env, keyXCoordinateArray);
     jint *keyYCoordinates = safeGetIntArrayElements(env, keyYCoordinateArray);
     jint *keyWidths = safeGetIntArrayElements(env, keyWidthArray);
@@ -59,19 +59,19 @@
     safeReleaseIntArrayElements(env, keyYCoordinateArray, keyYCoordinates);
     safeReleaseIntArrayElements(env, keyXCoordinateArray, keyXCoordinates);
     env->ReleaseIntArrayElements(proximityCharsArray, proximityChars, 0);
-    return (jint)proximityInfo;
+    return (jlong)proximityInfo;
 }
 
-static void latinime_Keyboard_release(JNIEnv *env, jobject object, jint proximityInfo) {
+static void latinime_Keyboard_release(JNIEnv *env, jobject object, jlong proximityInfo) {
     ProximityInfo *pi = (ProximityInfo*)proximityInfo;
     if (!pi) return;
     delete pi;
 }
 
 static JNINativeMethod sKeyboardMethods[] = {
-    {"setProximityInfoNative", "(IIIII[II[I[I[I[I[I[F[F[F)I",
+    {"setProximityInfoNative", "(IIIII[II[I[I[I[I[I[F[F[F)J",
             (void*)latinime_Keyboard_setProximityInfo},
-    {"releaseProximityInfoNative", "(I)V", (void*)latinime_Keyboard_release}
+    {"releaseProximityInfoNative", "(J)V", (void*)latinime_Keyboard_release}
 };
 
 int register_ProximityInfo(JNIEnv *env) {
diff --git a/native/jni/com_android_inputmethod_latin_BinaryDictionary.cpp b/native/jni/com_android_inputmethod_latin_BinaryDictionary.cpp
index 18c9724..42d0e32 100644
--- a/native/jni/com_android_inputmethod_latin_BinaryDictionary.cpp
+++ b/native/jni/com_android_inputmethod_latin_BinaryDictionary.cpp
@@ -33,6 +33,7 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
+#include <unistd.h>
 #else // USE_MMAP_FOR_DICTIONARY
 #include <stdlib.h>
 #endif // USE_MMAP_FOR_DICTIONARY
@@ -41,19 +42,19 @@
 
 void releaseDictBuf(void* dictBuf, const size_t length, int fd);
 
-static jint latinime_BinaryDictionary_open(JNIEnv *env, jobject object,
+static jlong latinime_BinaryDictionary_open(JNIEnv *env, jobject object,
         jstring sourceDir, jlong dictOffset, jlong dictSize,
         jint typedLetterMultiplier, jint fullWordMultiplier, jint maxWordLength, jint maxWords,
         jint maxAlternatives) {
     PROF_OPEN;
     PROF_START(66);
-    const char *sourceDirChars = env->GetStringUTFChars(sourceDir, NULL);
-    if (sourceDirChars == NULL) {
+    const char *sourceDirChars = env->GetStringUTFChars(sourceDir, 0);
+    if (sourceDirChars == 0) {
         LOGE("DICT: Can't get sourceDir string");
         return 0;
     }
     int fd = 0;
-    void *dictBuf = NULL;
+    void *dictBuf = 0;
     int adjust = 0;
 #ifdef USE_MMAP_FOR_DICTIONARY
     /* mmap version */
@@ -66,7 +67,7 @@
     adjust = dictOffset % pagesize;
     int adjDictOffset = dictOffset - adjust;
     int adjDictSize = dictSize + adjust;
-    dictBuf = mmap(NULL, sizeof(char) * adjDictSize, PROT_READ, MAP_PRIVATE, fd, adjDictOffset);
+    dictBuf = mmap(0, sizeof(char) * adjDictSize, PROT_READ, MAP_PRIVATE, fd, adjDictOffset);
     if (dictBuf == MAP_FAILED) {
         LOGE("DICT: Can't mmap dictionary. errno=%d", errno);
         return 0;
@@ -74,9 +75,9 @@
     dictBuf = (void *)((char *)dictBuf + adjust);
 #else // USE_MMAP_FOR_DICTIONARY
     /* malloc version */
-    FILE *file = NULL;
+    FILE *file = 0;
     file = fopen(sourceDirChars, "rb");
-    if (file == NULL) {
+    if (file == 0) {
         LOGE("DICT: Can't fopen sourceDir. sourceDirChars=%s errno=%d", sourceDirChars, errno);
         return 0;
     }
@@ -107,7 +108,7 @@
         LOGE("DICT: dictBuf is null");
         return 0;
     }
-    Dictionary *dictionary = NULL;
+    Dictionary *dictionary = 0;
     if (BinaryFormat::UNKNOWN_FORMAT == BinaryFormat::detectFormat((uint8_t*)dictBuf)) {
         LOGE("DICT: dictionary format is unknown, bad magic number");
 #ifdef USE_MMAP_FOR_DICTIONARY
@@ -121,23 +122,23 @@
     }
     PROF_END(66);
     PROF_CLOSE;
-    return (jint)dictionary;
+    return (jlong)dictionary;
 }
 
-static int latinime_BinaryDictionary_getSuggestions(JNIEnv *env, jobject object, jint dict,
-        jint proximityInfo, jintArray xCoordinatesArray, jintArray yCoordinatesArray,
+static int latinime_BinaryDictionary_getSuggestions(JNIEnv *env, jobject object, jlong dict,
+        jlong proximityInfo, jintArray xCoordinatesArray, jintArray yCoordinatesArray,
         jintArray inputArray, jint arraySize, jint flags,
         jcharArray outputArray, jintArray frequencyArray) {
     Dictionary *dictionary = (Dictionary*)dict;
     if (!dictionary) return 0;
     ProximityInfo *pInfo = (ProximityInfo*)proximityInfo;
 
-    int *xCoordinates = env->GetIntArrayElements(xCoordinatesArray, NULL);
-    int *yCoordinates = env->GetIntArrayElements(yCoordinatesArray, NULL);
+    int *xCoordinates = env->GetIntArrayElements(xCoordinatesArray, 0);
+    int *yCoordinates = env->GetIntArrayElements(yCoordinatesArray, 0);
 
-    int *frequencies = env->GetIntArrayElements(frequencyArray, NULL);
-    int *inputCodes = env->GetIntArrayElements(inputArray, NULL);
-    jchar *outputChars = env->GetCharArrayElements(outputArray, NULL);
+    int *frequencies = env->GetIntArrayElements(frequencyArray, 0);
+    int *inputCodes = env->GetIntArrayElements(inputArray, 0);
+    jchar *outputChars = env->GetCharArrayElements(outputArray, 0);
 
     int count = dictionary->getSuggestions(pInfo, xCoordinates, yCoordinates, inputCodes,
             arraySize, flags, (unsigned short*) outputChars, frequencies);
@@ -151,17 +152,17 @@
     return count;
 }
 
-static int latinime_BinaryDictionary_getBigrams(JNIEnv *env, jobject object, jint dict,
+static int latinime_BinaryDictionary_getBigrams(JNIEnv *env, jobject object, jlong dict,
         jcharArray prevWordArray, jint prevWordLength, jintArray inputArray, jint inputArraySize,
         jcharArray outputArray, jintArray frequencyArray, jint maxWordLength, jint maxBigrams,
         jint maxAlternatives) {
     Dictionary *dictionary = (Dictionary*)dict;
     if (!dictionary) return 0;
 
-    jchar *prevWord = env->GetCharArrayElements(prevWordArray, NULL);
-    int *inputCodes = env->GetIntArrayElements(inputArray, NULL);
-    jchar *outputChars = env->GetCharArrayElements(outputArray, NULL);
-    int *frequencies = env->GetIntArrayElements(frequencyArray, NULL);
+    jchar *prevWord = env->GetCharArrayElements(prevWordArray, 0);
+    int *inputCodes = env->GetIntArrayElements(inputArray, 0);
+    jchar *outputChars = env->GetCharArrayElements(outputArray, 0);
+    int *frequencies = env->GetIntArrayElements(frequencyArray, 0);
 
     int count = dictionary->getBigrams((unsigned short*) prevWord, prevWordLength, inputCodes,
             inputArraySize, (unsigned short*) outputChars, frequencies, maxWordLength, maxBigrams,
@@ -175,19 +176,19 @@
     return count;
 }
 
-static jboolean latinime_BinaryDictionary_isValidWord(JNIEnv *env, jobject object, jint dict,
+static jboolean latinime_BinaryDictionary_isValidWord(JNIEnv *env, jobject object, jlong dict,
         jcharArray wordArray, jint wordLength) {
     Dictionary *dictionary = (Dictionary*)dict;
     if (!dictionary) return (jboolean) false;
 
-    jchar *word = env->GetCharArrayElements(wordArray, NULL);
+    jchar *word = env->GetCharArrayElements(wordArray, 0);
     jboolean result = dictionary->isValidWord((unsigned short*) word, wordLength);
     env->ReleaseCharArrayElements(wordArray, word, JNI_ABORT);
 
     return result;
 }
 
-static void latinime_BinaryDictionary_close(JNIEnv *env, jobject object, jint dict) {
+static void latinime_BinaryDictionary_close(JNIEnv *env, jobject object, jlong dict) {
     Dictionary *dictionary = (Dictionary*)dict;
     if (!dictionary) return;
     void *dictBuf = dictionary->getDict();
@@ -217,11 +218,11 @@
 }
 
 static JNINativeMethod sMethods[] = {
-    {"openNative", "(Ljava/lang/String;JJIIIII)I", (void*)latinime_BinaryDictionary_open},
-    {"closeNative", "(I)V", (void*)latinime_BinaryDictionary_close},
-    {"getSuggestionsNative", "(II[I[I[III[C[I)I", (void*)latinime_BinaryDictionary_getSuggestions},
-    {"isValidWordNative", "(I[CI)Z", (void*)latinime_BinaryDictionary_isValidWord},
-    {"getBigramsNative", "(I[CI[II[C[IIII)I", (void*)latinime_BinaryDictionary_getBigrams}
+    {"openNative", "(Ljava/lang/String;JJIIIII)J", (void*)latinime_BinaryDictionary_open},
+    {"closeNative", "(J)V", (void*)latinime_BinaryDictionary_close},
+    {"getSuggestionsNative", "(JJ[I[I[III[C[I)I", (void*)latinime_BinaryDictionary_getSuggestions},
+    {"isValidWordNative", "(J[CI)Z", (void*)latinime_BinaryDictionary_isValidWord},
+    {"getBigramsNative", "(J[CI[II[C[IIII)I", (void*)latinime_BinaryDictionary_getBigrams}
 };
 
 int register_BinaryDictionary(JNIEnv *env) {
diff --git a/native/jni/jni_common.cpp b/native/jni/jni_common.cpp
index 8643f72..958abfd 100644
--- a/native/jni/jni_common.cpp
+++ b/native/jni/jni_common.cpp
@@ -32,14 +32,14 @@
  * Returns the JNI version on success, -1 on failure.
  */
 jint JNI_OnLoad(JavaVM* vm, void* reserved) {
-    JNIEnv* env = NULL;
+    JNIEnv* env = 0;
     jint result = -1;
 
     if (vm->GetEnv((void**) &env, JNI_VERSION_1_4) != JNI_OK) {
         LOGE("ERROR: GetEnv failed");
         goto bail;
     }
-    assert(env != NULL);
+    assert(env != 0);
 
     if (!register_BinaryDictionary(env)) {
         LOGE("ERROR: BinaryDictionary native registration failed");
@@ -63,7 +63,7 @@
 int registerNativeMethods(JNIEnv* env, const char* className, JNINativeMethod* methods,
         int numMethods) {
     jclass clazz = env->FindClass(className);
-    if (clazz == NULL) {
+    if (clazz == 0) {
         LOGE("Native registration unable to find class '%s'", className);
         return JNI_FALSE;
     }
diff --git a/native/jni/jni_common.h b/native/jni/jni_common.h
index 9548e1b..6741443 100644
--- a/native/jni/jni_common.h
+++ b/native/jni/jni_common.h
@@ -29,17 +29,17 @@
 
 inline jint *safeGetIntArrayElements(JNIEnv *env, jintArray jArray) {
     if (jArray) {
-        return env->GetIntArrayElements(jArray, NULL);
+        return env->GetIntArrayElements(jArray, 0);
     } else {
-        return NULL;
+        return 0;
     }
 }
 
 inline jfloat *safeGetFloatArrayElements(JNIEnv *env, jfloatArray jArray) {
     if (jArray) {
-        return env->GetFloatArrayElements(jArray, NULL);
+        return env->GetFloatArrayElements(jArray, 0);
     } else {
-        return NULL;
+        return 0;
     }
 }
 
diff --git a/native/src/basechars.h b/native/src/basechars.cpp
similarity index 98%
rename from native/src/basechars.h
rename to native/src/basechars.cpp
index 3843e11..31f1e18 100644
--- a/native/src/basechars.h
+++ b/native/src/basechars.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2009 The Android Open Source Project
+ * Copyright (C) 2011 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -14,8 +14,9 @@
  * limitations under the License.
  */
 
-#ifndef LATINIME_BASECHARS_H
-#define LATINIME_BASECHARS_H
+#include "char_utils.h"
+
+namespace latinime {
 
 /**
  * Table mapping most combined Latin, Greek, and Cyrillic characters
@@ -23,7 +24,7 @@
  * if c is not a combined character, or the base character if it
  * is combined.
  */
-static unsigned short BASE_CHARS[] = {
+const unsigned short BASE_CHARS[BASE_CHARS_SIZE] = {
     0x0000, 0x0001, 0x0002, 0x0003, 0x0004, 0x0005, 0x0006, 0x0007,
     0x0008, 0x0009, 0x000a, 0x000b, 0x000c, 0x000d, 0x000e, 0x000f,
     0x0010, 0x0011, 0x0012, 0x0013, 0x0014, 0x0015, 0x0016, 0x0017,
@@ -189,4 +190,5 @@
 
 // generated with:
 // cat UnicodeData.txt | perl -e 'while (<>) { @foo = split(/;/); $foo[5] =~ s/<.*> //; $base[hex($foo[0])] = hex($foo[5]);} for ($i = 0; $i < 0x500; $i += 8) { for ($j = $i; $j < $i + 8; $j++) { printf("0x%04x, ", $base[$j] ? $base[$j] : $j)}; print "\n"; }'
-#endif // LATINIME_BASECHARS_H
+
+} // namespace latinime
diff --git a/native/src/char_utils.h b/native/src/char_utils.h
index a69a35e..607dc51 100644
--- a/native/src/char_utils.h
+++ b/native/src/char_utils.h
@@ -19,8 +19,47 @@
 
 namespace latinime {
 
+inline static int isAsciiUpper(unsigned short c) {
+    return c >= 'A' && c <= 'Z';
+}
+
+inline static unsigned short toAsciiLower(unsigned short c) {
+    return c - 'A' + 'a';
+}
+
+inline static int isAscii(unsigned short c) {
+    return c <= 127;
+}
+
 unsigned short latin_tolower(unsigned short c);
 
+/**
+ * Table mapping most combined Latin, Greek, and Cyrillic characters
+ * to their base characters.  If c is in range, BASE_CHARS[c] == c
+ * if c is not a combined character, or the base character if it
+ * is combined.
+ */
+
+static const int BASE_CHARS_SIZE = 0x0500;
+extern const unsigned short BASE_CHARS[BASE_CHARS_SIZE];
+
+inline static unsigned short toBaseChar(unsigned short c) {
+    if (c < BASE_CHARS_SIZE) {
+        return BASE_CHARS[c];
+    }
+    return c;
+}
+
+inline static unsigned short toBaseLowerCase(unsigned short c) {
+    c = toBaseChar(c);
+    if (isAsciiUpper(c)) {
+        return toAsciiLower(c);
+    } else if (isAscii(c)) {
+        return c;
+    }
+    return latin_tolower(c);
+}
+
 } // namespace latinime
 
 #endif // LATINIME_CHAR_UTILS_H
diff --git a/native/src/correction.cpp b/native/src/correction.cpp
index 27dc407..22ee75a 100644
--- a/native/src/correction.cpp
+++ b/native/src/correction.cpp
@@ -21,6 +21,7 @@
 
 #define LOG_TAG "LatinIME: correction.cpp"
 
+#include "char_utils.h"
 #include "correction.h"
 #include "dictionary.h"
 #include "proximity_info.h"
@@ -48,13 +49,13 @@
 
     for (int i = 0; i < li - 1; ++i) {
         for (int j = 0; j < lo - 1; ++j) {
-            const uint32_t ci = Dictionary::toBaseLowerCase(input[i]);
-            const uint32_t co = Dictionary::toBaseLowerCase(output[j]);
+            const uint32_t ci = toBaseLowerCase(input[i]);
+            const uint32_t co = toBaseLowerCase(output[j]);
             const uint16_t cost = (ci == co) ? 0 : 1;
             dp[(i + 1) * lo + (j + 1)] = min(dp[i * lo + (j + 1)] + 1,
                     min(dp[(i + 1) * lo + j] + 1, dp[i * lo + j] + cost));
-            if (i > 0 && j > 0 && ci == Dictionary::toBaseLowerCase(output[j - 1])
-                    && co == Dictionary::toBaseLowerCase(input[i - 1])) {
+            if (i > 0 && j > 0 && ci == toBaseLowerCase(output[j - 1])
+                    && co == toBaseLowerCase(input[i - 1])) {
                 dp[(i + 1) * lo + (j + 1)] = min(
                         dp[(i + 1) * lo + (j + 1)], dp[(i - 1) * lo + (j - 1)] + cost);
             }
@@ -87,17 +88,15 @@
     int *const current = editDistanceTable + outputLength * (inputLength + 1);
     const int *const prev = editDistanceTable + (outputLength - 1) * (inputLength + 1);
     const int *const prevprev =
-            outputLength >= 2 ? editDistanceTable + (outputLength - 2) * (inputLength + 1) : NULL;
+            outputLength >= 2 ? editDistanceTable + (outputLength - 2) * (inputLength + 1) : 0;
     current[0] = outputLength;
-    const uint32_t co = Dictionary::toBaseLowerCase(output[outputLength - 1]);
-    const uint32_t prevCO =
-            outputLength >= 2 ? Dictionary::toBaseLowerCase(output[outputLength - 2]) : 0;
+    const uint32_t co = toBaseLowerCase(output[outputLength - 1]);
+    const uint32_t prevCO = outputLength >= 2 ? toBaseLowerCase(output[outputLength - 2]) : 0;
     for (int i = 1; i <= inputLength; ++i) {
-        const uint32_t ci = Dictionary::toBaseLowerCase(input[i - 1]);
+        const uint32_t ci = toBaseLowerCase(input[i - 1]);
         const uint16_t cost = (ci == co) ? 0 : 1;
         current[i] = min(current[i - 1] + 1, min(prev[i] + 1, prev[i - 1] + cost));
-        if (i >= 2 && prevprev && ci == prevCO
-                && co == Dictionary::toBaseLowerCase(input[i - 2])) {
+        if (i >= 2 && prevprev && ci == prevCO && co == toBaseLowerCase(input[i - 2])) {
             current[i] = min(current[i], prevprev[i - 2] + 1);
         }
     }
@@ -607,13 +606,7 @@
 }
 
 inline static bool isUpperCase(unsigned short c) {
-     if (c < sizeof(BASE_CHARS) / sizeof(BASE_CHARS[0])) {
-         c = BASE_CHARS[c];
-     }
-     if (isupper(c)) {
-         return true;
-     }
-     return false;
+     return isAsciiUpper(toBaseChar(c));
 }
 
 //////////////////////
diff --git a/native/src/dictionary.h b/native/src/dictionary.h
index d5de008..f891e74 100644
--- a/native/src/dictionary.h
+++ b/native/src/dictionary.h
@@ -17,7 +17,6 @@
 #ifndef LATINIME_DICTIONARY_H
 #define LATINIME_DICTIONARY_H
 
-#include "basechars.h"
 #include "bigram_dictionary.h"
 #include "char_utils.h"
 #include "defines.h"
@@ -63,7 +62,6 @@
     static int setDictionaryValues(const unsigned char *dict, const bool isLatestDictVersion,
             const int pos, unsigned short *c, int *childrenPosition,
             bool *terminal, int *freq);
-    static inline unsigned short toBaseLowerCase(unsigned short c);
 
 private:
     bool hasBigram();
@@ -156,19 +154,6 @@
     return position;
 }
 
-
-inline unsigned short Dictionary::toBaseLowerCase(unsigned short c) {
-    if (c < sizeof(BASE_CHARS) / sizeof(BASE_CHARS[0])) {
-        c = BASE_CHARS[c];
-    }
-    if (c >='A' && c <= 'Z') {
-        c |= 32;
-    } else if (c > 127) {
-        c = latin_tolower(c);
-    }
-    return c;
-}
-
 } // namespace latinime
 
 #endif // LATINIME_DICTIONARY_H
diff --git a/native/src/proximity_info.cpp b/native/src/proximity_info.cpp
index 763a3a1..6857caf 100644
--- a/native/src/proximity_info.cpp
+++ b/native/src/proximity_info.cpp
@@ -47,7 +47,7 @@
           HAS_TOUCH_POSITION_CORRECTION_DATA(keyCount > 0 && keyXCoordinates && keyYCoordinates
                   && keyWidths && keyHeights && keyCharCodes && sweetSpotCenterXs
                   && sweetSpotCenterYs && sweetSpotRadii),
-          mInputXCoordinates(NULL), mInputYCoordinates(NULL),
+          mInputXCoordinates(0), mInputYCoordinates(0),
           mTouchPositionCorrectionEnabled(false) {
     const int proximityGridLength = GRID_WIDTH * GRID_HEIGHT * MAX_PROXIMITY_CHARS_SIZE;
     mProximityCharsArray = new uint32_t[proximityGridLength];
@@ -167,7 +167,7 @@
         // We do not have the coordinate data
         return NOT_A_INDEX;
     }
-    const unsigned short baseLowerC = Dictionary::toBaseLowerCase(c);
+    const unsigned short baseLowerC = toBaseLowerCase(c);
     if (baseLowerC > MAX_CHAR_CODE) {
         return NOT_A_INDEX;
     }
@@ -232,7 +232,7 @@
         const unsigned short c, const bool checkProximityChars, int *proximityIndex) const {
     const int *currentChars = getProximityCharsAt(index);
     const int firstChar = currentChars[0];
-    const unsigned short baseLowerC = Dictionary::toBaseLowerCase(c);
+    const unsigned short baseLowerC = toBaseLowerCase(c);
 
     // The first char in the array is what user typed. If it matches right away,
     // that means the user typed that same char for this pos.
@@ -245,7 +245,7 @@
     // If the non-accented, lowercased version of that first character matches c,
     // then we have a non-accented version of the accented character the user
     // typed. Treat it as a close char.
-    if (Dictionary::toBaseLowerCase(firstChar) == baseLowerC)
+    if (toBaseLowerCase(firstChar) == baseLowerC)
         return NEAR_PROXIMITY_CHAR;
 
     // Not an exact nor an accent-alike match: search the list of close keys
diff --git a/native/src/proximity_info.h b/native/src/proximity_info.h
index 35e354c..832db10 100644
--- a/native/src/proximity_info.h
+++ b/native/src/proximity_info.h
@@ -56,7 +56,7 @@
     bool existsCharInProximityAt(const int index, const int c) const;
     bool existsAdjacentProximityChars(const int index) const;
     ProximityType getMatchedProximityId(const int index, const unsigned short c,
-            const bool checkProximityChars, int *proximityIndex = NULL) const;
+            const bool checkProximityChars, int *proximityIndex = 0) const;
     int getNormalizedSquaredDistance(const int inputIndex, const int proximityIndex) const {
         return mNormalizedSquaredDistances[inputIndex * MAX_PROXIMITY_CHARS_SIZE + proximityIndex];
     }
diff --git a/native/src/unigram_dictionary.cpp b/native/src/unigram_dictionary.cpp
index 8eb5a97..647bfde 100644
--- a/native/src/unigram_dictionary.cpp
+++ b/native/src/unigram_dictionary.cpp
@@ -253,12 +253,6 @@
     mProximityInfo = proximityInfo;
 }
 
-static inline void registerNextLetter(unsigned short c, int *nextLetters, int nextLettersSize) {
-    if (c < nextLettersSize) {
-        nextLetters[c]++;
-    }
-}
-
 // TODO: We need to optimize addWord by using STL or something
 // TODO: This needs to take an const unsigned short* and not tinker with its contents
 bool UnigramDictionary::addWord(unsigned short *word, int length, int frequency) {
@@ -470,8 +464,8 @@
     const bool hasMultipleChars = (0 != (UnigramDictionary::FLAG_HAS_MULTIPLE_CHARS & flags));
     int pos = startPos;
     int32_t character = BinaryFormat::getCharCodeAndForwardPointer(root, &pos);
-    int32_t baseChar = Dictionary::toBaseLowerCase(character);
-    const uint16_t wChar = Dictionary::toBaseLowerCase(inWord[startInputIndex]);
+    int32_t baseChar = toBaseLowerCase(character);
+    const uint16_t wChar = toBaseLowerCase(inWord[startInputIndex]);
 
     if (baseChar != wChar) {
         *outPos = hasMultipleChars ? BinaryFormat::skipOtherCharacters(root, pos) : pos;
@@ -483,8 +477,8 @@
     if (hasMultipleChars) {
         character = BinaryFormat::getCharCodeAndForwardPointer(root, &pos);
         while (NOT_A_CHARACTER != character) {
-            baseChar = Dictionary::toBaseLowerCase(character);
-            if (Dictionary::toBaseLowerCase(inWord[++inputIndex]) != baseChar) {
+            baseChar = toBaseLowerCase(character);
+            if (toBaseLowerCase(inWord[++inputIndex]) != baseChar) {
                 *outPos = BinaryFormat::skipOtherCharacters(root, pos);
                 *outInputIndex = startInputIndex;
                 return false;
diff --git a/native/src/unigram_dictionary.h b/native/src/unigram_dictionary.h
index ef9709a..4f4fef2 100644
--- a/native/src/unigram_dictionary.h
+++ b/native/src/unigram_dictionary.h
@@ -23,10 +23,6 @@
 #include "defines.h"
 #include "proximity_info.h"
 
-#ifndef NULL
-#define NULL 0
-#endif
-
 namespace latinime {
 
 class UnigramDictionary {