I think your diagnosis is right though: sometimes the layout is not triggered when a property is changed, the recent bug like that is
JDK-8307117<https://bugs.openjdk.org/browse/JDK-8307117> TextArea: wrapText property ignored when changing font I wonder if some kind of a generic unit test could be developed to identify such cases. -andy From: Nir Lisker <nlis...@gmail.com> Date: Monday, May 1, 2023 at 13:09 To: Andy Goryachev <andy.goryac...@oracle.com> Cc: openjfx-dev <openjfx-dev@openjdk.org> Subject: [External] : Re: JDK-8199934: ScrollPaneSkin incorrectly lays out its scrollbars If I knew what the fix was I would have. Right now I'm not sure anymore what the correct behavior should be even. On Mon, May 1, 2023 at 10:44 PM Andy Goryachev <andy.goryac...@oracle.com<mailto:andy.goryac...@oracle.com>> wrote: Nir, would you like to submit a pull request? Thank you -andy From: openjfx-dev <openjfx-dev-r...@openjdk.org<mailto:openjfx-dev-r...@openjdk.org>> on behalf of Nir Lisker <nlis...@gmail.com<mailto:nlis...@gmail.com>> Date: Sunday, April 30, 2023 at 10:04 To: openjfx-dev <openjfx-dev@openjdk.org<mailto:openjfx-dev@openjdk.org>> Subject: JDK-8199934: ScrollPaneSkin incorrectly lays out its scrollbars Hi, I took a quick jab at this issue [1]. Using the reproducer in the ticket, launch and resize the stage vertically so that the buttons at the bottom are only partially visible. The current behavior is as follows: When the scrollbar is not needed, toggling to the AS_NEEDED policy reallocates the scrollbar space for the buttons (they move up). When the scrollbar is needed, toggling to the AS_NEEDED policy still reallocates space, and the scrollbar takes away space from the content node. This is wrong. I modified the method 'computeHsbSizeHint' to private double computeHsbSizeHint(ScrollPane sp) { return determineHorizontalSBVisible() ? hsb.prefHeight(ScrollBar.USE_COMPUTED_SIZE) : 0; } Now the policy toggling behavior is correct both when the scrollbar is needed and when it's not - the space is reallocated not at the expense of the content. However, enlarging the stage horizontally while AS_NEEDED is selected does not reallocate the space (you need to toggle the policies). I'm guessing there's a missing call to layoutChildren during this resizing. Does anyone have any input here? Thanks, Nir [1] https://bugs.openjdk.org/browse/JDK-8199934
