RFR: 8318841: macOS: Memory leak with MenuItem when Menu.useSystemMenuBar(true) is used

[Kevin Rushforth]

On Thu, 2 Nov 2023 11:39:47 GMT, Johan Vos <jvos at openjdk.org> wrote:

> When the Java layer removes a systemmenu, release the native resources related to this systemmenu.
> This removes the strong JNI Global ref, which prevents its references from being gc'ed.
> 
> The current implementation for the mac-specific system menu creates a menu, but never releases its resources. In the `dealloc` of this menu, the strong jni refs are deleted.
> With this PR, we now release the native resources associated with a menuItem when that one is removed from a menu. A consequence is that this menuItem should never be used after being removed from its current menu (e.g. it should not be re-added, or its text/shortcut should not be altered). 
> The current implementation will create a new MacMenuDelegate every time a menuItem is inserted into a menu, so there should be no references to the native resources lingering.

Is it possible to add an automated regression test?

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PR Comment: https://git.openjdk.org/jfx/pull/1277#issuecomment-1790622466