intersphinx: Don't warn about pure-duplicate ambiguous definitions when loading 'objects.inv' entries.

sphinx/util/inventory.py

@@ -126,7 +126,7 @@ def load_v2(
         invdata: Inventory = {}
         projname = stream.readline().rstrip()[11:]
         version = stream.readline().rstrip()[11:]
-        potential_ambiguities = set()
+        potential_ambiguities: dict[str, tuple[str, str, str]] = {}
         actual_ambiguities = set()
         line = stream.readline()
         if 'zlib' not in line:
@@ -154,11 +154,16 @@ def load_v2(
                 # Some types require case insensitive matches:
                 # * 'term': https://github.com/sphinx-doc/sphinx/issues/9291
                 # * 'label': https://github.com/sphinx-doc/sphinx/issues/12008
-                definition = f"{type}:{name}"
-                if definition.lower() in potential_ambiguities:
-                    actual_ambiguities.add(definition)
+                definition, content = f"{type}:{name}", (prio, location, dispname)
+                lowercase_definition = definition.lower()
+                if lowercase_definition in potential_ambiguities:
+                    if potential_ambiguities[lowercase_definition] != content:
+                        actual_ambiguities.add(definition)
+                    else:
+                        logger.debug(__("inventory <%s> contains duplicate definitions of %s"),
+                                     uri, definition, type='intersphinx',  subtype='external')
                 else:
-                    potential_ambiguities.add(definition.lower())
+                    potential_ambiguities[lowercase_definition] = content
             if location.endswith('$'):
                 location = location[:-1] + name
             location = join(uri, location)

tests/test_util/intersphinx_data.py

@@ -59,4 +59,6 @@
 ''' + zlib.compress(b'''\
 a term std:term -1 glossary.html#term-a-term -
 A term std:term -1 glossary.html#term-a-term -
+b term std:term -1 document.html#id5 -
+B term std:term -1 document.html#B -
 ''')

tests/test_util/test_util_inventory.py

@@ -53,7 +53,8 @@ def test_ambiguous_definition_warning(warning):
     f = BytesIO(INVENTORY_V2_AMBIGUOUS_TERMS)
     InventoryFile.load(f, '/util', posixpath.join)
 
-    assert 'contains multiple definitions for std:term:a' in warning.getvalue().lower()
+    assert 'contains multiple definitions for std:term:a' not in warning.getvalue().lower()
+    assert 'contains multiple definitions for std:term:b' in warning.getvalue().lower()
 
 
 def _write_appconfig(dir, language, prefix=None):