Fix bug that can cause unexpected off-keyboard chars to appear as suggestions.

float ProximityInfoState::getPointToKeyLength(int inputIndex, int codePoint, float scale) {

    const int keyId = mProximityInfo->getKeyIndexOf(codePoint);

    if (keyId >= 0) {

    if (keyId != NOT_AN_INDEX) {

        const int index = inputIndex * mProximityInfo->getKeyCount() + keyId;

        return min(mDistanceCache[index] * scale, mMaxPointToKeyLength);

    }

    return 0;

    // If the char is not a key on the keyboard then return the max length.

    return MAX_POINT_TO_KEY_LENGTH;

}

int ProximityInfoState::getKeyKeyDistance(int key0, int key1) {