drscheme:get/extend:extend-interactions-canvas

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`drscheme:get/extend:extend-interactions-canvas`

The unextended class is canvas:wide-snip%. This canvas is used in the bottom window of drscheme frames.

(drscheme:get/extend:extend-interactions-canvas interactions-canvas-mixin) -> void
interactions-canvas-mixin : a procedure that accepts a class and produces a class derived from it.