[Bug][2.4.0 RC] A deadlock occurs when OpenGL initialization and Native events overlap on macOS

> OS version: macOS 10.15.4
> Architecture: x86_64
> OpenGL version: 4.1
> Java version: 1.8.0_242
> JOGL version: v2.4.0-rc-20200307 (0779f229b0e9538c640b18b9a4e095af1f5a35b3)
>
> When using JOGL in the latest 2.4.0 RC build
> (https://jogamp.org/deployment/archive/rc/v2.4.0-rc-20200307) , when OpenGL
> initialization and macOS Native events are fired simultaneously, two threads
> in "AWT-EventQueue-0" and "AWT-AppKit" will cause a deadlock and hang the
> application.
>
> The native events that we are currently checking are JMenu display switching
> and JFrame resizing. Both must be done manually. Deadlocks occur when using
> either GLCanvas or GLJPanel.
>
> The log at the time of the hang suggests that the bug 1398 fix commit
>  (https://jogamp.org/bugzilla/show_bug.cgi?id=1398)  is affecting it.
>
> Please refer to the following links for the sample code, the reproduction
> video using GLJPanel, the thread dump and the debug log when it hangs.
>
> https://drive.google.com/drive/folders/1F4-5YoO549XEdF5lWqvY_PXv59MPQ0i9
>
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