When you scroll to the middle of a grid, and you start editing some cells, the scrollbar content is moving up little by little.
See attached video.

Steps to reproduce:
1) Run this sample:
"
import javafx.application.Application;
import javafx.beans.property.SimpleStringProperty;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableRow;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.control.cell.TextFieldTableCell;
import javafx.scene.layout.HBox;
import javafx.scene.layout.Priority;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
import javafx.util.Callback;

public class TableViewRowHeight extends Application {

    private TableView<Person> table = new TableView<>();
    private final ObservableList<Person> data = FXCollections.observableArrayList();
    final HBox hb = new HBox();

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

    @Override
    public void start(Stage stage) {
        for (int i = 0; i < 100; ++i) {
            data.add(new Person("Row " + i));
        }

        stage.setTitle("Table View Sample");
        stage.setWidth(600);
        stage.setHeight(800);

        table.setEditable(true);

        TableColumn firstNameCol = new TableColumn("First Name");
        firstNameCol.setMinWidth(100);
        firstNameCol.setCellValueFactory(
                new PropertyValueFactory<Person, String>("firstName"));
        firstNameCol.setCellFactory(TextFieldTableCell.forTableColumn());

        table.setRowFactory(new Callback<TableView<Person>, TableRow<Person>>() {
            @Override
            public TableRow<Person> call(TableView<Person> p) {
                return new TableRow<Person>() {
                    @Override
                    protected double computePrefHeight(double width) {
                        return getIndex() > 5 ? 150 : 24;
                    }
                };
            }
        });

        table.setItems(data);
        table.getColumns().addAll(firstNameCol);

        final Button goToCell = new Button("Go to cell 50");
        goToCell.setOnAction(new EventHandler<ActionEvent>() {
            @Override
            public void handle(ActionEvent e) {
                table.scrollTo(50);
            }
        });

        final VBox vbox = new VBox();
        vbox.setSpacing(5);
        vbox.setPadding(new Insets(10, 0, 0, 10));
       
        HBox hbox = new HBox(table);
        HBox.setHgrow(table, Priority.ALWAYS);
        vbox.getChildren().addAll(goToCell, hbox);
         VBox.setVgrow(hbox, Priority.ALWAYS);
        Scene scene = new Scene(vbox);

        stage.setScene(scene);
        stage.show();
    }

    public static class Person {

        private final SimpleStringProperty firstName;

        private Person(String fName) {
            this.firstName = new SimpleStringProperty(fName);
        }

        public String getFirstName() {
            return firstName.get();
        }

        public void setFirstName(String fName) {
            firstName.set(fName);
        }

    }
}
"
2) Click on the "Go to cell 50" button
3) Double click on cell 52

Actual behavior:
The content is moved little by little toward the top

Expected behavior:
The content stays still.


Explanation:
This is a regression introduced in OpenJFX 17 by JDK-8089589. When we edit a cell, the VirtualFlow is trying to compute an estimated height of the whole content based of a few cell. At each iteration, it adds 2 more cells.
My fifth first cell height are 24px and the rest is 150px. Therefore, each time, the content estimation is growing a little by little, causing the scrollbar content to adjust.

The new API is completely private or package protected, therefore, I do not have any solution or work-around for this issue.