How to remove dock icon on Mac when main stage is hidden?

I'm trying to implement a "minimize to system tray" functionality, where when the user closes the app's window, it disappears from the task bar and can be retrieved from the system tray. This works great on Windows and Linux, but on the Mac, the window closes, but the app's icon remains in the dock. Clicking on the dock icon focuses the app, but (perhaps unsurprisingly) does not open the window, which is a pretty bad user experience. Opening the window from the system tray works, so if I could just hide the dock icon I'd be there.
I found the undocumented PlatformImpl.setTaskbarApplication(false), but it doesn't seem to have any effect. Probably only does something at launch time.
Bug or feature?
(I'm using the new Platform.setImplicitExit(false) to keep the app from exiting when the main stage is hidden, but I see the same behavior when using the "create an off-screen dummy stage" kludge in 2.1.)

Whatever you did last time didn't work - don't try that again!
Back up everything before you begin.
Bootcamp Assistant (in Applications/Utilities) will remove Windows partitions, however I expect in this state it will remove the Windows 7 partition. It may resolve the issue, but it will delete all the Windows data. Perhaps Bootcamp Assistant does something extra compared to deleting the partition by hand?
If it still has the multiple boot icons you will have to erase the HD completely and then restore your OS and user data.
Do you really want to erase & start over for this minor issue?

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