Yes it's following on from the RUBRIC editing page and is proving to be a pain in the neck, I wish now I had not started this, as the problem is in the way that particular editing page is set up. It would have been better for
MDL-30780 to have been set to use the report layout as this would give it more flexibility.
As it is now you get a shift to the right of the whole editing page it you attempt to add horizontal scroll bars, so it's not behaving as one would expect, which leads me to think Marina has got the whole design of the page wrong. But since that part is nothing to do with themes I'll stay out of it.
But since the end result is affecting how themes work in that area, and in some ways is related to other page layout problems, and as there are a few other layouts that I am planning on looking at, I'll leave it open for the moment, and keep working on it, but may close it eventually as wont fix.