On Fri, 3 May 2024 14:45:24 GMT, John Hendrikx <jhendr...@openjdk.org> wrote:

> This PR provides a fix for the linked issue.
> 
> The issue was that when an invalidation listener is removed, and the 
> `ExpressionHelper` type changes from `Generic` to `SingleChange` that it 
> would copy the current value of the `Generic` instance before it was updated 
> (this is because invalidation listeners trigger before change listeners and 
> the current value would only be updated **after** invalidation listeners 
> notifications were completed).
> 
> The code now will update the current value before sending out any 
> notifications **if** there are change listeners present to head off this 
> problem.
> 
> Added a few test cases to verify this.
> 
> Note: the PR which replaces `ExpressionHelper` does not have this problem: 
> https://github.com/openjdk/jfx/pull/1081

The fix works as expected. However, I hope that we can get #1081 in as a 
replacement.

-------------

Marked as reviewed by mstrauss (Committer).

PR Review: https://git.openjdk.org/jfx/pull/1448#pullrequestreview-2042311784

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