RFR: 8351867: No UI changes while iconified

[John Hendrikx]

On Thu, 13 Mar 2025 14:51:19 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> My thought on this bug was to fix it in the scenegraph, rather than forcing a complete repaint in the toolkit. The scenegraph tracks the state of what is dirty and would only need to repaint if something has changed (and probably only those parts that have changed).
> 
> @arapte Can you take a look at this and see what you think? I am not able to look at it for at least a week.

Yeah, I'm sort of mimicking what happens when a RESCALE or MOVE occurs, so it is similar to what some of the other handlers do (MOVE does `updateSceneState`, and RESCALE does that and `entireSceneNeedsRepaint`).  I'm not that well versed in the differences between these two, but it seemed not a bad place to fix this as restores happen very rarely.

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PR Comment: https://git.openjdk.org/jfx/pull/1733#issuecomment-2721719308