add-selected

Selects snips without deselecting other snips.

The selection in a pasteboard can be changed by the system in response to other method calls, and such changes do not go through this method; use on-select to monitor selection changes.

• (send a-pasteboard add-selected snip) -> void
      snip : snip% object

  Selects snip.

  
  

• (send a-pasteboard add-selected x y w h) -> void
      x : real number
      y : real number
      w : non-negative real number
      h : non-negative real number

  Selects all snips that intersect with the given rectangle (in editor coordinates).