JMenuItems lose display resolution in a JMenu while editing

[igarshep]

On OSX with Eclipse 4.31.0, and using the latest version of WindowBuilder, when working with JMenuItems inside of a JMenu, the text and menu seems like its losing focus/resolution as I edit it.

For example, it starts like this:

and if I alternate between the items, the whole menu contents start losing resolution/losing focus and the thing just seems like its trying to warp away. Probably the quickest way is just trying to add a JMenuItem and choosing a spot, just moving where the Item will go will quickly make the menu lose focus.

[ptziegler]

I can't reproduce this issue on Linux, so I assume that's a Mac-specific problem. I can have a look if/when the the screenshots are taken but without an actual machine, there's probably not much else that I can do right now. 😦