move/copy-to-edit

This moves or copies text and snips to another edit.

• (send a-text:basic move/copy-to-edit dest-text start end dest-pos) -> void
      dest-text : (instance text%)
      start : exact-integer
      end : exact-integer
      dest-pos : exact-integer

  Moves or copies from the edit starting at start and ending at end. It puts the copied text and snips in dest-text starting at location dest-pos.

  If a snip refused to be moved, it will be copied, otherwise it will be moved. A snip may refuse to be moved by returning #f from release-from-owner.