White box / window flicker upon launch

[Kevin Rushforth]

Sorry for the delay in responding. I can reproduce this on macOS. I 
haven't tried on Linux, but I suspect it will reproduce there as well. I 
added an evaluation to the bug report:

https://bugs.openjdk.java.net/browse/JDK-8243939

I don't think this will be an easy bug to fix. In the mean time, the 
suggested workaround of setting the Scene fill to a color that matches 
(as closely as possible) the color of the scene as it is initially 
rendered is the best I can think of.

-- Kevin


On 4/23/2020 4:52 AM, Dirk Lemmermann wrote:
> Ticket created: ID 9064689
>
> Dirk
>
>> On 23 Apr 2020, at 13:40, Dirk Lemmermann <dlemmermann at gmail.com> wrote:
>>
>> I think this is a bug … I will create a ticket for it. When this behaviour was fixed for Swing in Java 6 it made a huge difference in the perception of the quality and performance of Java applications. Could do the same for JavaFX.
>>
>> Dirk
>>
>>
>>> On 22 Apr 2020, at 20:17, Tom Schindl <tom.schindl at bestsolution.at> wrote:
>>>
>>> yes I do but I think this is by nature:
>>>
>>> a) you use CSS so only after the first CSS-Pass the color could be set
>>>   appropriately, this CSS pass could happen after the Native-Window is
>>>   shown
>>>   => you can mitigate that a bit using
>>>   root.setBackground(new Background(new BackgroundFill(Color.ORANGE,
>>>      CornerRadii.EMPTY, Insets.EMPTY)));
>>>
>>> b) if the above gives you short flash (IMHO shorter than with CSS) and
>>>   you can see that by setting eg RED or GREEN as the Scene-Fill so then
>>>   it gets more prominent
>>>
>>> So the flash is gone if you put the same color to Scene.setFill() as your root-Pane but now something slightly unexpected happens. The trim is colored slighly in your scene-color ;-)
>>>
>>> Tom
>>>
>>> Am 22.04.20 um 19:46 schrieb Dirk Lemmermann:
>>>> import javafx.application.Application;
>>>> import javafx.scene.Scene;
>>>> import javafx.scene.layout.VBox;
>>>> import javafx.stage.Stage;
>>>> public class BugDemo extends Application {
>>>>     public void start(Stage stage) {
>>>>         VBox root = new VBox();
>>>>         root.setStyle("-fx-background-color: orange;");
>>>>         Scene scene = new Scene(root, 1000, 800);
>>>>         stage.setScene(scene);
>>>>         stage.show();
>>>>     }
>>>>     public static void main(String[] args) {
>>>>         launch(args);
>>>>     }
>>>> }