RFR: 8338190: TOC vertical offsets not updated when document size changes

[Jonathan Gibbons]

On Mon, 12 Aug 2024 12:59:13 GMT, Hannes Wallnöfer <hannesw at openjdk.org> wrote:

> Please review a simple change to switch to a [better suited API](https://developer.mozilla.org/en-US/docs/Web/API/ResizeObserver) to track changes in document size in `javadoc`-generated pages. In addition to changes in the size of the browser viewport, the new code handles changes coming from page content, such as showing different subsets of members in a member summary table.
> 
> This issue is labeled `noreg-hard` since we don't have a way to test resize behaviour in an automated way. I manually tested the change in Chrome, Firefox and Safari on various desktop and mobile platforms. The `ResizeObserver` API has been implemented in supported browsers [between early 2018 and early 2020](https://developer.mozilla.org/en-US/docs/Web/API/ResizeObserver/ResizeObserver#browser_compatibility).

I'm not an expert and I note the `noreg-hard`.
But the change seems reasonable.

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Marked as reviewed by jjg (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/20547#pullrequestreview-2246098962