code: func TextViewNewWithBuffer(buf *TextBuffer) (*TextView, error) {
  	cbuf := buf.native()
  	c := C.gtk_text_view_new_with_buffer(cbuf)
  	return wrapTextView(glib.Take(unsafe.Pointer(c))), nil
  }
docs: // TextViewNewWithBuffer is a wrapper around gtk_text_view_new_with_buffer().