The editor should work out of the box, we (the Eclipse platform team) fixed that before the Luna release, at least for JDT and CDT. I think what you are seeing is the “Terminal” bug, i.g., if you include the new terminal (or download a version of Luna which includes that you get this white background). This is already fixed and should be contained in the 4.4.1 release.
See https://bugs.eclipse.org/bugs/show_bug.cgi?id=438175 for details on the bug.