Hi guys,
i just came thru the Scintila documentation and found this:
http://sphere.sourceforge.net/flik/docs/scintilla-folding.html
it seems that we could add the blocks folding without too much pain… is there any other alternative ?
In the past, @samaaron has said that he is not a fan of the idea of block folding in Sonic Pi. I’ll let him comment on whether this is still the case…
ok, anyway, i did write to Sam, so i can wait his answer regarding the GUI dev.
i should also mention, that there is an other tool, useful for programmers or children, it is the line-marker that can be recalled by hiting the numerical keys… like most of the code editors 
i do understand that the goal is to keep it very simple, but adding the basic coding tools is necessary for most of our students that have worked on other text editors…
thx