[Bug] Handle is moved when touched after sibling view stub is inflated

Setup

I have a vertical linear layout with a RecyclerView and a banner ViewStub above it.

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

    <ViewStub
        android:id="@+id/stub"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout="@layout/list_item"/>

    <com.qtalk.recyclerviewfastscroller.RecyclerViewFastScroller
        android:id="@+id/fastScroller"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        app:handleHeight="40dp"
        app:handleWidth="40dp"
        app:handleHasFixedSize="true">

        <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/recycler"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
            />
    </com.qtalk.recyclerviewfastscroller.RecyclerViewFastScroller>
    
</LinearLayout>

Banner view stub is inflated later, after some conditions are met. To simplify this:

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        findViewById<RecyclerView>(R.id.recycler).run {
            adapter = MyListAdapter().also { it.submitList((0..100).toList()) }
        }

        Handler().postDelayed({
            findViewById<ViewStub>(R.id.stub).inflate()
        }, 500)
    }
}

Behavior

Actual After view stub is inflated, handle is moved down when touched (approximately by an inflated view height). List is also scrolled down. Touch position does not correspond to a handle position.

Expected Handle is not moved when touched. Handle is moved under a finger.

Here is the project that reproduces this issue: testfastscroll.zip

Can you suggest any workarounds?

[vokilam]

Initial issue is fixed. Issue mentioned in https://github.com/quiph/RecyclerView-FastScroller/issues/38#issuecomment-701258330 is still reproducible

[shahsurajk]

@vokilam , can you create a new issue with the details mentioned so it becomes easier to track. i’ll close this one.