Gtk.Editable::set_selection_bounds

function vfunc_set_selection_bounds(start_pos:Number, end_pos:Number):void {
}

Selects a region of text. The characters that are selected are those characters at positions from start_pos up to, but not including end_pos. If end_pos is negative, then the characters selected are those characters from start_pos to the end of the text.

Note that positions are specified in characters, not bytes.