[Fluxus] pixel-render more abstract note

[gabor papp]

> all of the editor within Fluxus itself. As I see it we may one day need the
> ability to pop to the top-most renderer, run something, then immediately
> push back, without this always being a "exception" as such (though it might
can't you store the errors and display them later on the top-most 
renderer instead. on the other hand, you can probably hack it using 
(renderer-grab) and (renderer-ungrab).

best,
gabor