RFR: 8340344: The first item in TreeView is not aligned in the beginning [v5]

[Andy Goryachev]

On Wed, 14 May 2025 14:43:05 GMT, Ziad El Midaoui <zelmidaoui at openjdk.org> wrote:

>> Also noticed a scenario: When a TreeCell with disclosureNode is currently not shown on screen but becomes visible on scrolling. In that case the TreeCells are layout while the scroll is in progress. I see only one way to avoid this that maxDisclosureWidthMap should reflect the correct value before starting the layout.
>
> Yes true,
> the default value of the `defaultDisclosureWidth` when there is no disclosureNode is 18 and when we come across a TreeCell that has a disclosure node the `defaultDisclosureWidth` changes to 20 that is what causes the TreeCells to move visually.
> My first thought was to change the default value as that would avoid doing the re-layout and would reflect the the correct value before starting the layout also visually we won't see that change in the TreeCells position.

> In that case the TreeCells are layout while the scroll is in progress.

does this create any visual artifacts?

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PR Review Comment: https://git.openjdk.org/jfx/pull/1715#discussion_r2089188397