RFR: 8233179: VetoableListDecorator#sort throws IllegalArgumentException "duplicate children"

[Kevin Rushforth]

On Tue, 14 Jan 2025 00:55:36 GMT, Michael Strauß <mstrauss at openjdk.org> wrote:

> The `VetoableListDecorator` class does not override the default implementation of `List.sort()`. The default implementation copies the elements into an array, sorts the array, and then calls `List.set()` in a loop to sort the List **without removing the old elements first**. This leads to the `VetoableListDecorator` intercepting the call to `set()` and seeing a "duplicate child" being added.
> 
> The solution is to implement `SortableList.doSort()` with the following protocol:
> 1. Make a copy of the list and sort it.
> 2. Present the sorted list with `onProposedChange` for a potential veto.
> 3. If successful, use `setAll()` to swap out the current list with the sorted list.

@andy-goryachev-oracle or @arapte Could one of you be the second reviewer?

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PR Comment: https://git.openjdk.org/jfx/pull/1674#issuecomment-2682669596