do-copy

Called to copy the editor's current selection into the clipboard. This method is provided so that it can be overriden by subclasses. Do not call this method directly; instead, call copy .

• (send a-pasteboard do-copy time extend?) -> void
      time : exact integer
      extend? : boolean

  Copy the current selection, extending the current clipboard contexnts if extend? is true.

  See Cut and Paste for a discussion of the time argument. If time is outside the platform-specific range of times, an exn:application:mismatch exception is raised.