RFR: JMC-6313: Exit menu item alternates visibility in "File" dropdown menu

[Alex Macdonald]

Hi,

The following webrev [0] addresses issue JMC-6313 [1], in which the Exit
option in the menubar toggles visibility.

The culprit here is the recent files list, which is supplied by the
ReopenEditorMenu via Eclipse Platform UI [2]. When added to a menu, the
ReopenEditorMenu has an interesting effect where subsequent menu items
alternate being included and being missing from the menu when the menu is
opened. I cloned the Platform UI repo to try and poke around, and I ran
into an issue where the subsequent menu items actually aren't added to the
menu every-other click. I recreated this behaviour on a simple RCP
application and opened a bug report on the Eclipse bugzilla [3].

For what it's worth, the Recent Files list should be added to it's own
submenu. Placing the list into it's own submenu is also a workaround
because we won't be adding an Exit action sequentially in the menu after
the Recent Files list. The included patch [0] adds a new submenu
"recentMenu" and adds a couple of separators to distinguish it from it's
neighbouring menu items.

Images [4]:
I've included a couple of images of before [5] and after [6] this patch, as
well as a couple of gifs (before [7] & after [8]) that show the issue and
proposed solution.

Thoughts?

Cheers,

Alex

[0] http://cr.openjdk.java.net/~aptmac/JMC-6313/webrev.00/
[1] https://bugs.openjdk.java.net/browse/JMC-6313
[2]
http://git.eclipse.org/c/platform/eclipse.platform.ui.git/tree/bundles/org.eclipse.ui.workbench/Eclipse%20UI/org/eclipse/ui/internal/ReopenEditorMenu.java
[3] https://bugs.eclipse.org/bugs/show_bug.cgi?id=543269
[4] https://imgur.com/a/pJkEoKQ
[5] https://imgur.com/gnV5aFw
[6] https://imgur.com/8S4L7wi
[7] https://imgur.com/GlVZ0Ut
[8] https://imgur.com/jh6lDoH