RFR: 8328577: Toolbar's overflow button overlaps the items [v4]

[eduardsdv]

On Fri, 12 Apr 2024 15:21:14 GMT, eduardsdv <duke at openjdk.org> wrote:

>> This change fixes the calculation of which nodes go to the toolbar and which go to the overflow menu.
>> It is now determined before the nodes are removed from the scene graph.
>> This is important because the values returned by ``Node.prefWidth(..)``/``Node.prefHeight(..)`` may depend on whether the node is added to the scene graph.
>> 
>> Furthermore I corrected the ``hasOveflow`` value passed to the ``organizeOverflow(double, boolean)`` in ``correctOverflow(double)``.
>
> eduardsdv has updated the pull request incrementally with one additional commit since the last revision:
> 
>   JDK-8328577: Collect overflowed items in a shadow (overflowBox) pane

I solved the issue with applying of CSS by introducing a 'shadow' pane (``overflowBox``).
This pane contains the overflowed items all the time unless overflow menu is open.
After the overflow menu is closed the items are moved back the to the pane.

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PR Comment: https://git.openjdk.org/jfx/pull/1434#issuecomment-2051974734