diff --git a/CHANGES b/CHANGES
index a7b565e79b3..87b35403da2 100644
--- a/CHANGES
+++ b/CHANGES
@@ -25,6 +25,8 @@ Bugs fixed
   ``autodoc_typehints="description"``
 * #8180: autodoc: Docstring metadata ignored for attributes
 * #10443: epub: EPUB builder can't detect the mimetype of .webp file
+* #10104: gettext: Duplicated locations are shown if 3rd party extension does
+  not provide correct information
 * #10456: py domain: ``:meta:`` fields are displayed if docstring contains two
   or more meta-field
 * #9096: sphinx-build: the value of progress bar for paralle build is wrong
diff --git a/EXAMPLES b/EXAMPLES
index da41e20e22c..1f1d92365b2 100644
--- a/EXAMPLES
+++ b/EXAMPLES
@@ -40,7 +40,7 @@ Documentation using the alabaster theme
 * `pytest <https://docs.pytest.org/>`__ (customized)
 * `python-apt <https://apt-team.pages.debian.net/python-apt/>`__
 * `PyVisfile <https://documen.tician.de/pyvisfile/>`__
-* `Requests <https://docs.python-requests.org/>`__
+* `Requests <https://requests.readthedocs.io/>`__
 * `searx <https://asciimoo.github.io/searx/>`__
 * `Spyder <https://docs.spyder-ide.org/>`__ (customized)
 * `Tablib <http://docs.python-tablib.org/>`__
diff --git a/doc/conf.py b/doc/conf.py
index 8da5f4b1617..a0d2f4df994 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -109,7 +109,7 @@
 
 intersphinx_mapping = {
     'python': ('https://docs.python.org/3/', None),
-    'requests': ('https://docs.python-requests.org/en/latest/', None),
+    'requests': ('https://requests.readthedocs.io/en/latest/', None),
     'readthedocs': ('https://docs.readthedocs.io/en/stable', None),
 }
 
diff --git a/doc/usage/restructuredtext/directives.rst b/doc/usage/restructuredtext/directives.rst
index 847f0372b87..4029b04e67b 100644
--- a/doc/usage/restructuredtext/directives.rst
+++ b/doc/usage/restructuredtext/directives.rst
@@ -592,6 +592,13 @@ __ https://pygments.org/docs/lexers
 
       .. versionadded:: 1.3
 
+   .. rst:directive:option:: class: class names
+      :type: a list of class names separated by spaces
+
+      The class name of the graph.
+
+      .. versionadded:: 1.4
+
    .. rst:directive:option:: dedent: number
       :type: number or no value
 
@@ -758,6 +765,9 @@ __ https://pygments.org/docs/lexers
       Added the ``diff``, ``lineno-match``, ``caption``, ``name``, and
       ``dedent`` options.
 
+   .. versionchanged:: 1.4
+      Added the ``class`` option.
+
    .. versionchanged:: 1.5
       Added the ``start-at``, and ``end-at`` options.
 
diff --git a/sphinx/builders/gettext.py b/sphinx/builders/gettext.py
index e8bc547b77f..0d7d0ac11d8 100644
--- a/sphinx/builders/gettext.py
+++ b/sphinx/builders/gettext.py
@@ -57,7 +57,8 @@ def add(self, msg: str, origin: Union[Element, "MsgOrigin"]) -> None:
 
     def __iter__(self) -> Generator[Message, None, None]:
         for message in self.messages:
-            positions = [(source, line) for source, line, uuid in self.metadata[message]]
+            positions = sorted(set((source, line) for source, line, uuid
+                                   in self.metadata[message]))
             uuids = [uuid for source, line, uuid in self.metadata[message]]
             yield Message(message, positions, uuids)
 
diff --git a/tests/test_build_gettext.py b/tests/test_build_gettext.py
index 3c4617e849c..cca6fab929b 100644
--- a/tests/test_build_gettext.py
+++ b/tests/test_build_gettext.py
@@ -8,9 +8,29 @@
 
 import pytest
 
+from sphinx.builders.gettext import Catalog, MsgOrigin
 from sphinx.util.osutil import cd
 
 
+def test_Catalog_duplicated_message():
+    catalog = Catalog()
+    catalog.add('hello', MsgOrigin('/path/to/filename', 1))
+    catalog.add('hello', MsgOrigin('/path/to/filename', 1))
+    catalog.add('hello', MsgOrigin('/path/to/filename', 2))
+    catalog.add('hello', MsgOrigin('/path/to/yetanother', 1))
+    catalog.add('world', MsgOrigin('/path/to/filename', 1))
+
+    assert len(list(catalog)) == 2
+
+    msg1, msg2 = list(catalog)
+    assert msg1.text == 'hello'
+    assert msg1.locations == [('/path/to/filename', 1),
+                              ('/path/to/filename', 2),
+                              ('/path/to/yetanother', 1)]
+    assert msg2.text == 'world'
+    assert msg2.locations == [('/path/to/filename', 1)]
+
+
 @pytest.mark.sphinx('gettext', srcdir='root-gettext')
 def test_build_gettext(app):
     # Generic build; should fail only when the builder is horribly broken.