Dialogs sometimes ignores the max height when the pref height of the dialog content is bigger.
This will lead to a visual glitch where the dialog is flickering between the max height and the pref height.
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- First layout pass: The dialog will incorrectly resize to a the pref height, which is bigger than the max height.
- Second layout pass: The dialog will correctly resize to the max height
... (repeat)

--- TESTCASE SOURCE START ---
import javafx.application.Application;
import javafx.scene.control.ButtonType;
import javafx.scene.control.Dialog;
import javafx.scene.control.Label;
import javafx.scene.layout.Background;
import javafx.scene.layout.BackgroundFill;
import javafx.scene.layout.HBox;
import javafx.scene.layout.StackPane;
import javafx.scene.paint.Color;
import javafx.stage.Stage;

public class ScrollPaneApp extends Application {

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

    @Override
    public void start(Stage primaryStage) throws Exception {
        StackPane stackPane = new StackPane();
        stackPane.setBackground(new Background(new BackgroundFill(Color.RED, null, null)));
        stackPane.setPrefHeight(700);

        Dialog<ButtonType> dialog = new Dialog<>();

        dialog.getDialogPane().setContent(stackPane);
        dialog.getDialogPane().setMaxHeight(400);

        dialog.show();
    }
}
--- TESTCASE SOURCE END---