res/layout/grid_header.xml


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<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="8dp">
    <!-- height should be list_item_general_margin - grid_item_vertical_spacing -->
</FrameLayout>