drscheme:get/extend:extend-definitions-canvas

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

The unextended class is drscheme:unit:definitions-canvas%. This canvas is used in the top window of drscheme frames.

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