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.

