Signal-Android/app/src/main/res/layout/search_toolbar.xml

<?xml version="1.0" encoding="utf-8"?>
<merge xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_height="wrap_content"
    android:layout_width="match_parent"
    tools:parentTag="android.widget.LinearLayout"
    tools:orientation="vertical">

    <androidx.appcompat.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="@color/signal_background_primary"/>

    <View android:layout_width="match_parent"
          android:layout_height="5dp"
          android:background="@drawable/toolbar_shadow"/>

</merge>