RFR: 8359266: Delete the usage of AppContext in the GraphicsDevice

[Alexey Ivanov]

On Fri, 20 Jun 2025 20:28:43 GMT, Alexey Ivanov <aivanov at openjdk.org> wrote:

>>> I mean that there's a _happens before_ relation each time the synchronized block is reach whereas with volatile, the _happens before_ relation is guaranteed only when the value of the variable changes.
>> 
>> I do not think that this is true "guaranteed only when the value of the variable changes".
>>>A write to a volatile field ([§8.3.1.4](https://docs.oracle.com/javase/specs/jls/se14/html/jls-8.html#jls-8.3.1.4)) happens-before every subsequent read of that field.
>
> Exactly! A *write* to a volatile field.
> 
> Yet entering and leaving a synchronized block gives a happens-before relation *each time*.

What I mean is two threads that called `GraphicsDevice.getFullScreenWindow` still established a *happens-before* relation for each call, which will be gone with the volatile modifier.

It may be fine… or may be not… this is why I'm asking.

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PR Review Comment: https://git.openjdk.org/jdk/pull/25818#discussion_r2159631528