[racket] Line folding in DrRacket

Is there a way to fold lines in DrRacket (for pure text files)?

I.e., say there is a file in the editor, with line numbers displayed:
1  This is the first line.
2  This is the second line.
3  This is the third line.

and I want to fold line 2, the editor would then only show:
1  This is the first line.
3  This is the third line.

but of course line 2 is not really deleted, just hidden.
I don't mean something like wxWidgets, i.e., the file itself is not changed
and remains pure text.

If not, what would it take roughly to implement such a feature?

Thanks,
Laurent
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