edit-menu:undo

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`edit-menu:undo`

This function will be called when the Undo item of the Edit menu is selected by the user. If you are working with frames that have wx:media-edit% objects in them, see do-edit.

(send a-mred:simple-menu-frame edit-menu:undo) -> void
This sends the undo message to the wx:media-edit% that is returned by get-edit for this frame, via do-edit.

PLT