I took a stab at adding line numbers to DrRacket. I started with this
code from Grant Rettke:
http://www.wisdomandwonder.com/link/1808/adding-a-gutter-to-drscheme
which works reasonably well on its own but when I had trouble
integrating it with DrRacket.
I think the way to go is to extend the definitions-canvas but the issue
there is I can't seem to add new panel objects to the canvas. I can pass
the definitions-text% straight through via (super-new [editor editor]).
I tried making a proxy text%/editor-canvas% combo but I just had the
same issue of not being able to add any elements to it.
So I guess the question is can I put more gui elements in a canvas?
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