blink-caret in snip%

Tells the snip to blink the selection caret. This method is called periodically when the snips's editor's display has the keyboard focus, and the snip has the editor-local focus.

The drawing context and snip's locations in drawing context coordinates are provided.

• (send a-snip blink-caret dc x y) -> void
     dc : dc<%> object
     x : real number
     y : real number