after-select (augmentable only) in pasteboard%

This method is called after a snip in the pasteboard is selected or deselected. See also on-select. This method is not called after selected snip is deleted (and thus de-selected indirectly); see also after-delete.

See also can-select? and on-edit-sequence.

No internals locks are set when this method is called.

• (send a-pasteboard after-select snip on?) -> void
     snip : snip% object
     on? : boolean

  If on? is #t, then snip was just selected, otherwise snip was just deselected.