[ListView] ListView not downsizing cells when its breadth shrinks

I have a cell that binds it's preferred width to the width of the ListView. When I widen the ListView, the cell expands accordingly. But when I shrink the ListView, the cell never shrinks.

This may (or may not) have to do with this comment in VirtualFlow.java:

    * - If the width and/or height has been reduced (but neither of
    * them has been expanded), then we simply have to reposition and
    * resize the scroll bars

So this might have been intended as a feature, but I see it more as a bug.

My use case is a ListView of TextFlows and I want to have the TextFlows wrapped at the the ListView's width. (I am developing CodeAreaFX[1] and a user asked for line wrapping, which would get us quite close to a rich text area.)

Here is the code:

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.ListCell;
import javafx.scene.control.ListView;
import javafx.scene.layout.Region;
import javafx.scene.layout.StackPane;
import javafx.scene.text.Text;
import javafx.scene.text.TextFlow;
import javafx.stage.Stage;

public class Test extends Application {

    private static class MyCell extends ListCell<String> {
        public MyCell(ListView<String> lv) {
            setMaxWidth(Region.USE_PREF_SIZE);
            prefWidthProperty().bind(lv.widthProperty());
        }

        @Override
        protected void updateItem(String item, boolean empty) {
            super.updateItem(item, empty);
            setGraphic(empty ? null : new TextFlow(new Text(item)));
        }
    }

    @Override
    public void start(Stage stage) {
        ListView<String> listView = new ListView<>();
        listView.setCellFactory(lv -> new MyCell(lv));
        listView.getItems().add("This is a very long line that needs to be wrapped");

        StackPane stack = new StackPane();
        stack.getChildren().add(listView);
        Scene scene = new Scene(stack, 200, 100);
        stage.setScene(scene);
        stage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}


If I run it and then reduce the window width, the cell with the TextFlow never shrinks.


[1] https://github.com/TomasMikula/CodeAreaFX