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. ------------- Commit messages: - When the Java layer removes a systemmenu, release the native resources related to this systemmenu. Changes: https://git.openjdk.org/jfx/pull/1277/files Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1277&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8318841 Stats: 3 lines in 2 files changed: 3 ins; 0 del; 0 mod Patch: https://git.openjdk.org/jfx/pull/1277.diff Fetch: git fetch https://git.openjdk.org/jfx.git pull/1277/head:pull/1277 PR: https://git.openjdk.org/jfx/pull/1277
