ADDITIONAL SYSTEM INFORMATION :
OpenJFX EAP: 13-ea+6

OpenJDK:
openjdk version "13-internal" 2019-09-17
OpenJDK Runtime Environment (build 13-internal+0-jdk13-jpackage.49)
OpenJDK 64-Bit Server VM (build 13-internal+0-jdk13-jpackage.49, mixed mode, sharing)


A DESCRIPTION OF THE PROBLEM :
I have ListView with several thousands items and enabled multi-select. When I try to select many items in ListView it hung whole application.

This functionality works fine in JDK 8 (I could select millions of item without any delays) but looks like was broken after this release.

REGRESSION : Last worked in version 8u192

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run test application (here Maven project for any case: https://github.com/maxd/listview_multiselect_performance ) or from code below.

Manual steps to reproduce:

1. Select first item in ListView
2. Scroll down to last item in ListView
3. Press `SHIFT` key and select last item

Steps to reproduce from code:

1. Click `Select %d items and measure selection time`

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Selected items must be selected without delay
ACTUAL -
Selection of multiple items hung application and macOS show mac rainbow wheel (it's mean that application doesn't respond).

---------- BEGIN SOURCE ----------
import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.Scene;
import javafx.scene.control.Alert;
import javafx.scene.control.Button;
import javafx.scene.control.ListView;
import javafx.scene.control.SelectionMode;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class App extends Application {
    @Override
    public void start(Stage stage) {
        int itemsCount = 20_000;

        ObservableList<String> list = FXCollections.observableArrayList();

        for (int i = 0; i < itemsCount; i++) {
            list.add(String.format("%07d", i));
        }

        ListView<String> listView = new ListView<>(list);
        listView.getSelectionModel().setSelectionMode(SelectionMode.MULTIPLE);

        Button button = new Button(String.format("Select %d items and measure selection time", itemsCount));
        button.setOnAction(actionEvent -> {
            long timestamp = System.currentTimeMillis();

            listView.getSelectionModel().selectRange(0, itemsCount - 1); // <== Here `selectRange` take a lot of time to select items

            String message = String.format("Selection time: %d seconds", (System.currentTimeMillis() - timestamp) / 1000);
            Alert alert = new Alert(Alert.AlertType.INFORMATION, message);
            alert.initOwner(stage);
            alert.showAndWait();
        });

        stage.setScene(new Scene(new VBox(listView, button)));
        stage.show();
    }
}

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

FREQUENCY : always