fix: deterministic page sorting in reading-order model (#141)

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

Author: cau-git

docling_ibm_models/reading_order/reading_order_rb.py

@@ -112,7 +112,7 @@ def predict_reading_order(
  page_to_footers[page_no] = self._predict_page(elems)
 
  sorted_elements = []
- for page_no in page_nos:
+ for page_no in sorted(page_nos):
  sorted_elements.extend(page_to_headers[page_no])
  sorted_elements.extend(page_to_elems[page_no])
  sorted_elements.extend(page_to_footers[page_no])