Disable popup preview and long press on disabled key

Bug: 4268147
Change-Id: Ibcb54791ef78737dd09d8a594b5a53b0909609d6

java/src/com/android/inputmethod/keyboard/Key.java

@@ -379,7 +379,7 @@ public class Key {
      * @see android.graphics.drawable.StateListDrawable#setState(int[])
      */
     public int[] getCurrentDrawableState() {
-        final boolean pressed = mEnabled && mPressed;
+        final boolean pressed = mPressed;
         if (!mSticky && mFunctional) {
             if (pressed) {
                 return KEY_STATE_FUNCTIONAL_PRESSED;

java/src/com/android/inputmethod/keyboard/PointerTracker.java

@@ -546,6 +546,9 @@ public class PointerTracker {
     }
 
     private void showKeyPreviewAndUpdateKeyGraphics(int keyIndex) {
+        final Key key = getKey(keyIndex);
+        if (key != null && !key.mEnabled)
+            return;
         updateKeyGraphics(keyIndex);
         // The modifier key, such as shift key, should not be shown as preview when multi-touch is
         // supported. On the other hand, if multi-touch is not supported, the modifier key should
@@ -565,6 +568,8 @@ public class PointerTracker {
             return;
         }
         Key key = getKey(keyIndex);
+        if (!key.mEnabled)
+            return;
         if (key.mCode == Keyboard.CODE_SHIFT) {
             mHandler.startLongPressShiftTimer(mLongPressShiftKeyTimeout, keyIndex, this);
         } else if (key.mManualTemporaryUpperCaseCode != Keyboard.CODE_DUMMY