remove-selected in pasteboard%

Deselects a snip without deselecting any 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 remove-selected snip) -> void
     snip : snip% object

  Deselects snip (if it is currently selected).