title: Margins not working on a scrollview
body: <p>XML:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  xmlns:fancy="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:background="@color/colorBlack"
  android:fillViewport="true"
  android:orientation="vertical"&gt;
  
  &lt;android.support.constraint.ConstraintLayout
      android:layout_width="match_parent"
      android:layout_height="0dp"
      android:background="@color/colorNavigationKolBG"
      android:focusable="true"
      android:focusableInTouchMode="true"
      android:orientation="vertical"&gt;
  
    &lt;!-- FORM STUFF HERE, I CUT IT OUT --&gt;
  
      &lt;mehdi.sakout.fancybuttons.FancyButton
          android:id="@+id/btn_add_pic"
          android:layout_width="250dp"
          android:layout_height="40dp"
          android:layout_marginEnd="8dp"
          android:layout_marginLeft="8dp"
          android:layout_marginRight="8dp"
          android:layout_marginStart="8dp"
          android:layout_marginTop="7dp"
          app:layout_constraintLeft_toLeftOf="parent"
          app:layout_constraintRight_toRightOf="parent"
          app:layout_constraintTop_toBottomOf="@+id/descriptionForm"
          fancy:fb_borderColor="@color/colorNavigationKolBTN"
          fancy:fb_borderWidth="1dp"
          fancy:fb_defaultColor="@color/colorNavigationKolBTN"
          fancy:fb_focusColor="#3B5F6A"
          fancy:fb_fontIconResource="&amp;#xf030;"
          fancy:fb_fontIconSize="20sp"
          fancy:fb_iconPosition="left"
          fancy:fb_radius="0dp"
          fancy:fb_text="Add Image"
          fancy:fb_textColor="#FFFFFF"
          fancy:fb_textSize="20sp" /&gt;
  
      &lt;mehdi.sakout.fancybuttons.FancyButton
          android:id="@+id/btn_submit"
          android:layout_width="250dp"
          android:layout_height="60dp"
          android:layout_marginBottom="8dp"
          android:layout_marginEnd="8dp"
          android:layout_marginLeft="8dp"
          android:layout_marginRight="8dp"
          android:layout_marginStart="8dp"
          android:layout_marginTop="8dp"
          app:layout_constraintLeft_toLeftOf="parent"
          app:layout_constraintRight_toRightOf="parent"
          app:layout_constraintTop_toBottomOf="@+id/linearImageLayout"
          fancy:fb_borderColor="@color/colorNavigationKolBTN"
          fancy:fb_borderWidth="1dp"
          fancy:fb_defaultColor="@color/colorNavigationKolBTN"
          fancy:fb_focusColor="#3B5F6A"
          fancy:fb_fontIconResource="&amp;#xf00c;"
          fancy:fb_fontIconSize="20sp"
          fancy:fb_iconPosition="left"
          fancy:fb_radius="0dp"
          fancy:fb_text="Submit"
          fancy:fb_textColor="#FFFFFF"
          fancy:fb_textSize="20sp" /&gt;
  
  
      &lt;LinearLayout
          android:id="@+id/linearImageLayout"
          android:layout_width="0dp"
          android:layout_height="150dp"
          android:layout_marginEnd="8dp"
          android:layout_marginLeft="8dp"
          android:layout_marginRight="8dp"
          android:layout_marginStart="8dp"
          android:layout_marginTop="8dp"
          android:background="@drawable/border"
          app:layout_constraintLeft_toLeftOf="parent"
          app:layout_constraintRight_toRightOf="parent"
          app:layout_constraintTop_toBottomOf="@+id/btn_add_pic"
          fancy:srcCompat="@color/cardview_light_background"&gt;
  
          &lt;ImageView
              android:id="@+id/imageForm"
              android:layout_width="match_parent"
              android:layout_height="150dp" /&gt;
  
      &lt;/LinearLayout&gt;
  
  
  &lt;/android.support.constraint.ConstraintLayout&gt;
  </code></pre>
  
  <p>The imageview visibility is set to gone, when an user adds an image the visibility changes to visible and the imageview pushes the submit button downward.</p>
  
  <p>However, the result is undesirable, it makes the submit button anchor to the very bottom of the layout. As you can see below:
  <a href="https://i.stack.imgur.com/gEHSM.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/gEHSM.png" alt="enter image description here"></a></p>
  
  <p>My quesiton is, how can I make this layout respect the bottom margin of the submit button?</p>