When I open a 2.5MB XML in Idea 7.0.5, I don't see code folding controls or anything in the structural view. "Validate" and "XML Refactorings" menu items don't show up in either the context menu or the menu bar. Reformatting doesn't work, either.
It's as if Idea does not recognize this as an XML file.
I'm able to open, manipulate and validate this file in Oxygen with no errors, so I know the file is fine.
Is this a known problem in 7.X, and if so has it been fixed in 8 or 9? If not, I'll file a bug.