resized in snip-admin%

Called by a snip to notify the administrator that the specified snip has changed its display size. The snip generally needs to be updated after a resize, but the snip decides whether the update should occur immediately.

The method call is ignored if the given snip is not managed by this administrator.

• (send a-snip-admin resized snip refresh?) -> void
     snip : snip% object
     refresh? : boolean

  If refresh? is not #f, then the snip is requesting to be updated immediately, as if calling needs-update. Otherwise, needs-update must eventually be called as well.