Merge "Fix jank on conversation screen" into rvc-dev

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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

              android:id="@+id/onboarding"

              android:layout_width="match_parent"

              android:layout_height="match_parent"

              android:layout_gravity="center"

              android:gravity="center"

              android:visibility="gone"

              android:orientation="vertical">

    <ImageView

import android.content.Context;

import android.os.AsyncTask;

import android.service.notification.ConversationChannelWrapper;

import android.view.View;

import androidx.preference.Preference;

import androidx.preference.PreferenceCategory;

import com.android.settings.R;

import com.android.settings.notification.NotificationBackend;

import com.android.settingslib.widget.LayoutPreference;

import java.util.Collections;

import java.util.List;

public class NoConversationsPreferenceController extends ConversationListPreferenceController {

    @Override

    public void updateState(Preference preference) {

        LayoutPreference pref = (LayoutPreference) preference;

        // Load conversations

        new AsyncTask<Void, Void, Void>() {

            @Override

                if (mContext == null) {

                    return;

                }

                pref.findViewById(R.id.onboarding).setVisibility(mConversations.size() == 0

                        ? View.VISIBLE : View.GONE);

                preference.setVisible(mConversations.size() == 0);

            }

        }.execute();