RFR: 8268642: Improve property system to facilitate correct usage

[Kevin Rushforth]

On Tue, 27 Jul 2021 23:15:10 GMT, Michael Strauß <mstrauss at openjdk.org> wrote:

> 3. Align un-binding of unidirectional content bindings with regular unidirectional bindings

Same comment as for item 4. We need to finish the discussion of whether and how to do this.

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PR: https://git.openjdk.java.net/jfx/pull/590