FULL PRODUCT VERSION :
java version "1.8.0_161"
Java(TM) SE Runtime Environment (build 1.8.0_161-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.161-b12, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
macOS 10.13.3

A DESCRIPTION OF THE PROBLEM :
When displaying text that contains accented characters, where the accents are combining characters, the text gets corrupted when wrapped.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run the attached program

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The text wraps on word boundaries
ACTUAL -
The text gets corrupted

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import javafx.application.Application;
import javafx.scene.control.Alert;
import javafx.scene.control.Alert.AlertType;
import javafx.stage.Stage;

public class Test extends Application
{
    public static void main(
        String[] args)
    {
        launch(args);
    }

    @Override
    public void start(
        Stage primaryStage) throws Exception
    {
        final Alert alert = new Alert(AlertType.CONFIRMATION);
        alert.getDialogPane().setContentText("this is a long path á/it has combining characters çã/and it has some more to make it wrap çã/");
        alert.showAndWait();
    }
}
---------- END SOURCE ----------