Fix incorrect call to JM_refresh_links() in Document.update_object().

Addresses #3070.

src/__init__.py

@@ -201,6 +201,19 @@ def _as_fz_page(page):
         return page
     assert 0, f'Unrecognised {type(page)=}'
 
+def _as_pdf_page(page):
+    '''
+    Returns page as a mupdf.PdfPage, downcasting as required. If we fail (i.e.
+    page is a mupdf.FzPage(), <ret>.m_internal will be None.
+    '''
+    if isinstance(page, Page):
+        page = page.this
+    if isinstance(page, mupdf.PdfPage):
+        return page
+    elif isinstance(page, mupdf.FzPage):
+        return mupdf.pdf_page_from_fz_page(page)
+    assert 0, f'Unrecognised {type(page)=}'
+
 
 # Fixme: we don't support JM_MEMORY=1.
 JM_MEMORY = 0
@@ -5638,7 +5651,7 @@ def update_object(self, xref, text, page=None):
         new_obj = JM_pdf_obj_from_str(pdf, text)
         mupdf.pdf_update_object(pdf, xref, new_obj)
         if page:
-            JM_refresh_links( mupdf.pdf_page_from_fz_page(page.super()))
+            JM_refresh_links( _as_pdf_page(page))
 
     def update_stream(self, xref=0, stream=None, new=1, compress=1):
         """Replace xref stream part."""

tests/test_general.py

@@ -794,3 +794,10 @@ def test_2957_2():
         w0 = words0[i]  # word before redaction
         bbox0 = fitz.Rect(w0[:4]).irect  # its IRect coordinates
         assert bbox0 == bbox1  # must be same coordinates
+
+def test_3070():
+    with fitz.open(os.path.abspath(f'{__file__}/../../tests/resources/test_3070.pdf')) as pdf:
+      links = pdf[0].get_links()
+      links[0]['uri'] = "https://www.ddg.gg"
+      pdf[0].update_link(links[0])
+      pdf.save(os.path.abspath(f'{__file__}/../../tests/test_3070_out.pdf'))