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

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:background="@drawable/signal_context_menu_background">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/inline_query_results_list"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center_vertical"
        android:clipToPadding="false"
        android:orientation="horizontal"
        android:paddingHorizontal="8dp"
        app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager" />

</FrameLayout>