NestedScrollView + AppBarLayout内容落后

我已经实现了类似于
的设计 https://github.com/chrisbanes/cheesesquare

一个可折叠的工具栏，当滚动时，崩溃中的图像

A collapsible toolbar with an image inside that collapse when scrolling down

<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:fitsSystemWindows="true">

        <android.support.design.widget.AppBarLayout
            android:id="@+id/app_bar_layout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:fitsSystemWindows="true"
            android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

            <android.support.design.widget.CollapsingToolbarLayout
                android:id="@+id/collapsing_toolbar"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:fitsSystemWindows="true"
                app:contentScrim="?attr/colorPrimary"
                app:expandedTitleMarginEnd="64dp"
                app:expandedTitleMarginStart="48dp"
                app:layout_scrollFlags="scroll|exitUntilCollapsed">

                <android.support.v4.view.ViewPager xmlns:android="http://schemas.android.com/apk/res/android"
                    android:id="@+id/pager"
                    android:layout_width="match_parent"
                    android:layout_height="@dimen/picture_heigth"
                    android:fitsSystemWindows="true"
                    app:layout_collapseMode="parallax">

                </android.support.v4.view.ViewPager>


                <android.support.v7.widget.Toolbar
                    android:id="@+id/toolbar"
                    android:layout_width="match_parent"
                    android:layout_height="?attr/actionBarSize"
                    app:layout_collapseMode="pin"
                    app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />


            </android.support.design.widget.CollapsingToolbarLayout>
        </android.support.design.widget.AppBarLayout>

        <android.support.v4.widget.NestedScrollView
            android:id="@+id/scroll_view"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"         
            android:foreground="?android:windowContentOverlay"

            app:layout_behavior="@string/appbar_scrolling_view_behavior">
            LinearLayout
            android:id="@+id/root"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical">

它的作品很棒，但并不总是...例如在线性布局里面我有一个看法在我的休息请求完成后填满。这样做有助于推动观众，当我向下滚动时，所有内容都会再次进入正确的位置。

It works greats, but not always... For example inside in linear layout I have a view that gets filled after my rest request complete. This has the effect to push the content BEHIND the Viewpager , when i scroll down and up again everything goes into the right place again.

我在一些SO线程上看到在NestedSCrollVew上设置fill_vertical，它正在修复一些问题。实际上，内容不会落后，但是scrollView的底部是CUT ...
通过放置一些底部边缘来修复问题，但是它是动态的我不知道提前有什么余量...

I saw on some SO thread that by setting "fill_vertical" on the NestedSCrollVew it was fixing some of the problem. It actually does, the content doesn't go behind BUT the bottom of the scrollView is CUT... By putting some bottom margin it fixes the problem but has it is dynamic i don't known advance what margin to put...