RFR: JDK-8304960: ObservableListBase should defer constructing ListChangeBuilder

[John Hendrikx]

On Wed, 29 Mar 2023 15:31:49 GMT, Andy Goryachev <angorya at openjdk.org> wrote:

> the only place where this code might fail is when it gets accessed from multiple threads.

`ListChangeBuilder` itself is not thread safe :)

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PR Comment: https://git.openjdk.org/jfx/pull/1075#issuecomment-1488939702