code: func (v *TextBuffer) InsertAtCursor(text string) {
  	cstr := C.CString(text)
  	defer C.free(unsafe.Pointer(cstr))
  	C.gtk_text_buffer_insert_at_cursor(v.native(), (*C.gchar)(cstr), C.gint(len(text)))
  }
docs: // InsertAtCursor() is a wrapper around gtk_text_buffer_insert_at_cursor().