NestedScrollView 嵌套 viewpage时，viewpage不是第一页右滑viewpage却触发返回上个activity

### 问题描述

NestedScrollView 嵌套 viewpage时，viewpage不是第一页右滑viewpage却触发返回上个activity
NestedScrollView 内容不超出页面高度就没问题

- 预期行为：滑动viewpage应该返回viewpage前一个页面

- 实际行为：返回上个activity

### 出问题的代码：

代码调用：
final float factor = 0.5f;
final int edgeSize = SmartSwipe.dp2px(20, this);
final int shadowColor = 0x80000000;
final int shadowSize = SmartSwipe.dp2px(10, this);
SmartSwipeBack.activitySlidingBack(this
, null
, 0
, Color.TRANSPARENT
, shadowColor
, shadowSize
, factor
, DIRECTION_LEFT);

//activity代码：
public class TestActivity extends AppCompatActivity {
// private TextView textView;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_test);
initView();
fragmentList.add(new BlankFragment());
fragmentList.add(new BlankFragment());
}

private List fragmentList = new ArrayList();
private String[] strings = new String[]{"A","B","C","D"};
private void initView(){
TabLayout tab_layout = findViewById(R.id.tab_layout);
ViewPager viewPager = findViewById(R.id.viewPager);
MyAdapter fragmentAdater = new MyAdapter(getSupportFragmentManager());
viewPager.setAdapter(fragmentAdater);
tab_layout.setupWithViewPager(viewPager);
}

public class MyAdapter extends FragmentPagerAdapter {
public MyAdapter(FragmentManager fm) {
super(fm);
}

@Override
public int getCount() {
return 2;
}

@Override
public Fragment getItem(int position) {
return fragmentList.get(position);
}

@Nullable
@Override
public CharSequence getPageTitle(int position) {
return strings[position];
}
}
}

//xml布局代码：

```

### 当前使用的SmartSwipe版本号：
**1.1.2**
### 截图或gif

Reproduce the issue with TestActivity and the provided NestedScrollView, TabLayout, and ViewPager XML, using SmartSwipeBack.activitySlidingBack from version 1.1.2. Trace the gesture interaction between NestedScrollView, ViewPager, and the activity back-swipe handling; done means swiping a non-first ViewPager page moves to the previous page instead of finishing the activity.

Written by the indexing model from the issue text.