FULL PRODUCT VERSION :
java version "9.0.1"
Java(TM) SE Runtime Environment (build 9.0.1+11)
Java HotSpot(TM) 64-Bit Server VM (build 9.0.1+11, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 6.1.7601]

A DESCRIPTION OF THE PROBLEM :
Setting a skin and cell size in a stylesheet for the list-cell styleclass leads to a wrong computation of the popuplist of a combobox if you open it for the first time

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
* set a skin and cell-size for .list-cell in the css-file
* use a combobox in an appliation that contains e.g 4 items
* run the application and open the popuplist of the combobox

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Expected result would be that the popuplist shows all 4 entries without a scrollbar
ACTUAL -
The populist shows two and a half entry with a vertical scrollbar

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
css - file:

.list-cell {
   -fx-skin: "javafx.scene.control.skin.ListCellSkin";
   -fx-cell-size: 40px;
}
-----------------
Testapplication:
public class Main extends Application {
   @Override
   public void start(Stage primaryStage) {
      try {
         AnchorPane root = new AnchorPane();
         Scene scene = new Scene(root, 400, 400);
         scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm());

         ComboBox<String> combo = new ComboBox();
         combo.getItems().addAll("entry 1", "entry 2", "entry 3", "entry 4");
         root.getChildren().add(combo);

         primaryStage.setScene(scene);
         primaryStage.show();
      } catch (Exception e) {
         e.printStackTrace();
      }
   }

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


---------- END SOURCE ----------