can-reorder? (augmentable only) in pasteboard%

Called before a snip is moved in the pasteboard's front-to-back snip order. If the return value is #f, then the reordering will be aborted.

See also on-reorder and after-reorder.

The editor is internally locked for writing when this method is called (see also Locks).

• (send a-pasteboard can-reorder? snip to-snip before?) -> boolean
     snip : snip% object
     to-snip : snip% object
     before? : boolean

  If before? is #t, then snip is to be moved before to-snip, otherwise snip is to be moved after to-snip