Both DialogPane and ContextMenu have a child node with a style-class `graphic-container`. This leads to a corner case where an unwanted style is applied to ContextMenu when it is shown on a DialogPane.

To reproduce:

* Show a Dialog without a Header
* Show a ContextMenu with a MenuItem that has a Graphic Node
* Observe the alignment and spacing of the MenuItem Graphic Node relative to the MenuItem Label text

The same can be reproduced by running the following sample:

import javafx.application.Application;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.FlowPane;
import javafx.stage.Stage;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;

public class DialogPaneContextMenuCSSBug extends Application {

    public static final Image IMAGE = new Image("https://i.imgur.com/qE8IbBz.png");

    @Override
    public void start(final Stage primaryStage) {
        primaryStage.setTitle("JavaFX");

        final Button btnHeader = new Button("Header Dialog");
        btnHeader.setOnAction(e -> createDialog(primaryStage, DialogPaneType.HEADER_NODE).showAndWait());

        final Button btnHeaderText = new Button("Header Text Dialog");
        btnHeaderText.setOnAction(e -> createDialog(primaryStage, DialogPaneType.HEADER_TEXT).showAndWait());

        final Button btnNoHeader = new Button("No Header Dialog");
        btnNoHeader.setOnAction(e -> createDialog(primaryStage, DialogPaneType.NONE).showAndWait());

        FlowPane root = new FlowPane(btnHeader, btnHeaderText, btnNoHeader);
        root.setHgap(10);
        root.setVgap(10);
        root.setAlignment(Pos.CENTER);
        final Scene scene = new Scene(root, 300, 250);
        primaryStage.setScene(scene);
        // scene.getStylesheets().add(createStyleSheet());
        primaryStage.show();
    }

    private ContextMenu createContextMenu() {
        final MenuItem menuItem = new MenuItem("Menu Item Text", new ImageView(IMAGE));
        return new ContextMenu(menuItem);
    }

    private Dialog<String> createDialog(final Stage primaryStage, DialogPaneType dialogPaneType) {
        final Dialog<String> dialog = new Dialog<>();
        dialog.initOwner(primaryStage);
        final DialogPane dialogPane = new DialogPane();
        dialog.setOnCloseRequest(e -> dialog.close());

        final Label label = new Label("Right click me for context menu");
        final ContextMenu contextMenu = createContextMenu();
        label.setContextMenu(contextMenu);

        switch (dialogPaneType) {
            case HEADER_NODE -> dialogPane.setHeader(new Label("Header"));
            case HEADER_TEXT -> dialogPane.setHeaderText("Header Text");
        }
        dialogPane.setGraphic(new ImageView(IMAGE));
        dialogPane.setContent(label);
        dialogPane.getButtonTypes().add(ButtonType.CANCEL);
        dialog.setDialogPane(dialogPane);

        return dialog;
    }

    private enum DialogPaneType {
        HEADER_NODE,
        HEADER_TEXT,
        NONE
    }

    /** */
    /* Stylesheet related code */
    /* */
    private String createStyleSheet() {
        Path tempFile = null;
        try {
            tempFile = Files.createTempFile("", "");
            Files.writeString(tempFile, STYLE_SHEET);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return tempFile.toUri().toString();
    }

    private static String STYLE_SHEET =
            """
            .dialog-pane:no-header .graphic-container {
                -fx-padding: 0em 0.333em 0em 0em;
            }
        
            .dialog-pane:no-header > * > .graphic-container {
                -fx-padding: 0.833em 0 0 0.833em;
            }
            """;
}

Fix
-------
The following style in modena.css should be updated:

```
.dialog-pane:no-header .graphic-container {
    -fx-padding: 0em 0.333em 0em 0em;
}
```

to

```
.dialog-pane:no-header > * > .graphic-container {
    -fx-padding: 0em 0.333em 0em 0em;
}
```

Workaround
-----------------
The above CSS should be added to Application