Adding upstream version 0.11.12.

Signed-off-by: Daniel Baumann <daniel@debian.org>

roots/test-canonical/canonical.rst

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+.. post:: 2021-12-01
+   :tags: Canonical
+   :canonical_link: https://canonical.example.org/foo.html
+
+Canonical post
+=============
+
+This post will get generated, but its [canonical link](https://datatracker.ietf.org/doc/html/rfc6596)
+in the header will point to ``canonical_link``.

roots/test-canonical/conf.py

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+extensions = ["ablog"]
+
+# Enable Atom feed generation
+blog_baseurl = "https://blog.example.com/"
+# Include full post in feeds
+blog_feed_fulltext = True
+# Add a social media Atom feed
+blog_feed_templates = {
+    # Use defaults, no templates
+    "atom": {},
+    # Create content text suitable posting to micro-bogging
+    "social": {
+        # Format tags as hashtags and append to the content
+        "content": "{{ title }}{% for tag in post.tags %}" " #{{ tag.name|trim()|replace(' ', '') }}" "{% endfor %}",
+    },
+}
+# Sphinx creates canonical links pointing to this base URL by default
+html_baseurl = blog_baseurl

roots/test-canonical/index.rst

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+test-external
+=============

roots/test-canonical/post.rst

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+.. post:: 2022-12-01
+   :tags: Foo Tag, BarTag
+
+Foo Post Title
+==============
+
+    Foo post description `with link`_.
+
+Foo post content.
+
+.. _`with link`: https://example.com

roots/test-canonical/postlist.rst

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+postlist
+========
+
+.. postlist::