ADDITIONAL SYSTEM INFORMATION :
Java Version:

openjdk 12 2019-03-19
OpenJDK Runtime Environment (build 12+33)
OpenJDK 64-Bit Server VM (build 12+33, mixed mode, sharing)

JavaFX Version:

javafx.version=12
javafx.runtime.version=12+14
javafx.runtime.build=14



A DESCRIPTION OF THE PROBLEM :
When setting a LinearGradient or RadialGradient as the background of a Region—using CSS—it will use CycleMethod.REFLECT even when set to use CycleMethod.REPEAT. This **appears** to be caused by a bug in javafx.css.CssParser. Looking at the JavaFX 12 sources, inside CssParser#parseLinearGradient(Term), near line 1872 you'll see:

CycleMethod cycleMethod = CycleMethod.NO_CYCLE;
if ("reflect".equalsIgnoreCase(arg.token.getText())) {
    cycleMethod = CycleMethod.REFLECT;
    prev = arg;
    arg = arg.nextArg;
} else if ("repeat".equalsIgnoreCase(arg.token.getText())) {
    cycleMethod = CycleMethod.REFLECT; // PROBLEM HERE
    prev = arg;
    arg = arg.nextArg;
}

The same issue appears in CssParser#parseRadialGradient(Term) near line 2172.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. Create a Region
2. Set its background via CSS (external file or setStyle) using a "repeating" LinearGradient
3. Observe bug

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
LinearGradient should be using CycleMethod.REPEAT
ACTUAL -
LinearGradient is using CycleMethod.REFLECT

---------- BEGIN SOURCE ----------
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.layout.Region;
import javafx.scene.paint.LinearGradient;
import javafx.stage.Stage;

public class Main extends Application {

    @Override
    public void start(Stage primaryStage) {
        Region region = new Region();
        region.backgroundProperty().addListener((obs, ov, nv) -> {
            LinearGradient gradient = (LinearGradient) nv.getFills().get(0).getFill();
            System.out.println(gradient.getCycleMethod());
        });
        region.setStyle("-fx-background-color: linear-gradient(from 0% 0% to 25% 25%, repeat, red 33%, black 66%);");
        primaryStage.setScene(new Scene(region, 600, 400));
        primaryStage.show();
    }

}
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Set the background programmatically rather than through CSS.

FREQUENCY : always