RFR: 8273998: Clarify specification for Window properties controlled by the window manager

[Johan Vos]

On Fri, 7 Jan 2022 18:19:23 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> Update the API specification for the `Window` and `Stage` classes to clarify that the values for some properties and methods can be changed or ignored by the platform. Several of the properties already have a comment to the effect that the value can change externally, and thus the properties are not bindable, but this should be clarified further and for all such properties and methods.
> 
> See the Description of the JBS issues for this bug and its associated CSR for more details.

This looks ok to me. The clarifications make sense. There is unfortunately no guarantee about (low-level) cross-platform behaviour in these cases, but at least the JavaDoc makes this clear.

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PR: https://git.openjdk.java.net/jfx/pull/708