RFR: JDK-8284445: macOS 12 prints a warning when a function key shortcut is assigned to a menu

[Martin Fox]

On Mon, 2 Oct 2023 12:51:52 GMT, vlaaad <duke at openjdk.org> wrote:

> This PR addresses [JDK-8284445](https://bugs.openjdk.org/browse/JDK-8284445).
> 
> Context: the warning might be more important than it seems. Our JavaFX-based desktop app has [an issue](https://github.com/defold/defold/issues/7845) — when the user opens 2 instances of the app, one of the instances hangs after a while. While debugging the issue, I found that it's somehow related to the system menu bar — not refreshing it fixes the issue. Further investigations revealed that the app hangs only if we show menus that use F1-F24 shortcuts. This reminded me of the warnings we get about `NSEventModifierFlagFunction specified to -setKeyEquivalentModifierMask` for such shortcuts. I experimented with removing the modifier for these shortcuts, and it helped with our issue!

I will take a look.

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PR Comment: https://git.openjdk.org/jfx/pull/1252#issuecomment-1773220758