LPub3D, LDGlite and LDView changes layout

[Don Heyse]

I spent a considerable amount of time Investigating that and came to the conclusion that it'd be quite difficult to make it perfect, as long as lpub is making different layout decisions based on a single pixel difference in image size.  However there also appears to be some cruft in lpub3d image scaling code from the old lpub codebase that puts it off by more than a pixel with the images produced by ldview.

I could take a look at the disappearing main assemblies if you can provide an example where it happens. I have suspicions it's the znear setting, but it's challenging to reproduce the problem with limited resources.