The system menu bar tests in tests/manual/systemmenu require some expansion and cleanup.

- Add tests to verify that the correct thing happens when all windows are iconified. (If purely JavaFX you should see a single application menu. If purely Swing or if Swing is launched first you should see the set of menus associated with the last focused Swing window. Such a test should catch the case where the last focused Swing window is not the last window that had focus i.e. first a Swing window is iconified, then a JavaFX window is iconified).

- The test windows for JavaFX should include a Menu or ComboBox or some other control that brings up a PopupWindow. This should have no effect on what's in the system menu but currently the Mac glass platform code has to take steps to ensure that it doesn't.

- The tests were converted from automated tests to manual tests and the result can be a little confusing, there are busy loops trying to force the user to reproduce steps in a specific order. Either restore full automation (only launched manually) or complete the transition to fully manual.