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Changes between Initial Version and Version 1 of Ticket #17842, comment 6

initial	v1
3	3	Firstly, I assume that you've read my three initial posts in https://forums.virtualbox.org/viewtopic.php?f=8&t=93863. They contain several details about the necessary preconditions and an analysis of the sequence of events of the crash (from a black box testing perspective).
4	4
5		When researching the background of the crash (QCocoaMenuDelegate sending a message to an already destroyed NSMenuItem, possibly a race condition), I learned about a major design change in qcocoamenu.mm in QT 5.6.3 1, which has led to problems in several mainstream software, and has been amended several times in QT versions 5.6.3 2, 5.9 3 and 5.12 4. There are also several QT bugs linking to th~~ese commits, and some~~ more commits *5.
	5	When researching the background of the crash (QCocoaMenuDelegate sending a message to an already destroyed NSMenuItem, possibly a race condition), I learned about a major design change in qcocoamenu.mm in QT 5.6.3 1, which has led to problems in several mainstream software, and has been amended several times in QT versions 5.6.3 2, 5.9 3 and 5.12 4. There are also several QT bugs linking to those commits, and even more commits *5.
6	6
7	7	1: https://github.com/qt/qtbase/commit/09acf326dbc6b7b67f21a360be8c91605ce47f1e