get-error-range in drscheme:rep:text%

Indicates the highlighted error range. The state for the error range is shared across all instances of this class, so there can only be one highlighted error region at a time.

• (send a-drscheme:rep:text get-error-range) -> (union #f (list (instanceof text:basic% number number)))

  If #f, no region is highlighted. If a list, the first element is the editor where the range is highlighted and the second and third are the beginning and ending regions, respectively.