A DESCRIPTION OF THE PROBLEM :
Cell is not displayed when scrolling to the end of ListView with many cells.
300 cells was fine.
Problems arise when the number of cells exceeds 500-1000.

The following log is output when this problem occurs.

> javafx.scene.control.skin.VirtualFlow addTrailingCells
> INFO: index exceeds maxCellCount. Check size calculations for class javafx.scene.control.skin.ListViewSkin$2

This issue occurs in JavaFX 19. It works fine with JavaFX 11.

REGRESSION : Last worked in version 11.0.17

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
(1) Add 1000 cells to ListView.
(2) Call "scrollTo" with the last index of the ListView.
(3) Cells in ListView are not drawn.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
ListView cell is displayed.
ACTUAL -
ListView cells were not displayed.

---------- BEGIN SOURCE ----------
Cell is not displayed when scrolling to the end of ListView with many cells.
300 cells was fine.
Problems arise when the number of cells exceeds 500-1000.

The following log is output when this problem occurs.

> javafx.scene.control.skin.VirtualFlow addTrailingCells
> INFO: index exceeds maxCellCount. Check size calculations for class javafx.scene.control.skin.ListViewSkin$2

This issue occurs in JavaFX 19. It works fine with JavaFX 11.



//
// Sample.java
//
import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.ListView;
import javafx.stage.Stage;

import java.util.ArrayList;
import java.util.List;

public class Sample extends Application {

    @FXML private Button button;
    @FXML private ListView listView;

    @Override
    public void start(Stage primaryStage) throws Exception {
        FXMLLoader loader = new FXMLLoader(getClass().getResource("Sample.fxml"));
        loader.setController(this);
        Parent root = loader.load();
        Scene scene = new Scene(root);
        primaryStage.setScene(scene);
        primaryStage.show();

        button.setOnAction(this::button_onAction);

        List<String> items = new ArrayList<>();
        for(int i = 1; i <= 1000; i++) {
            items.add(Integer.toString(i));
        }
        listView.setItems(FXCollections.observableList(items));
    }

    private void button_onAction(ActionEvent event) {
        int lastIndex = listView.getItems().size() - 1;
        listView.scrollTo(lastIndex);
    }
}

//
// Sample.fxml
//
<?xml version="1.0" encoding="UTF-8"?>

<?import java.lang.*?>
<?import java.util.*?>
<?import javafx.scene.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>

<AnchorPane xmlns="http://javafx.com/javafx"
            xmlns:fx="http://javafx.com/fxml"
            prefHeight="400.0" prefWidth="600.0">

    <Button fx:id="button" text="SCROLL" />

    <ListView fx:id="listView"
              AnchorPane.leftAnchor="0.0"
              AnchorPane.rightAnchor="0.0"
              AnchorPane.topAnchor="32.0"
              AnchorPane.bottomAnchor="0.0" />
</AnchorPane>

---------- END SOURCE ----------

FREQUENCY : always