> You might want to show the effects of the first kind of ERT > only, but there is no useful way a program can see the difference > between the different kinds of ERT.
I disagree with you regarding the above paragraph, indicating you a counterexample: Scientific WorkPlace. (Please, notice, that I am not defending that SWP is, in general, superior to LyX; I definitely prefer LyX.) For instance, with SWP, if you insert the LaTeX code $x=y$, saving and closing the file, then, when you open again the same file, $x=y$ will be shown as WYSIWIG. Obviously, I am with you when you say that not all ERTs are visible.
