Clear spacebar sliding language switch diff

Change-Id: If82540b6632476e049fa9c4b3122e9c053227d6e
diff --git a/java/src/com/android/inputmethod/keyboard/PointerTracker.java b/java/src/com/android/inputmethod/keyboard/PointerTracker.java
index 42070cb..d975b39 100644
--- a/java/src/com/android/inputmethod/keyboard/PointerTracker.java
+++ b/java/src/com/android/inputmethod/keyboard/PointerTracker.java
@@ -542,6 +542,7 @@
                 mListener.onCodeInput(code, new int[] {code}, keyX, keyY);
             }
             mIsInSlidingLanguageSwitch = false;
+            ((LatinKeyboard)mKeyboard).setSpacebarSlidingLanguageSwitchDiff(0);
             return;
         }
         if (!mIsRepeatableKey) {