Up to now ReadTheDocs has been injecting code when building on their
platform. This includes for instance improvements for the search function.

To maintain the current output ReadTheDocs requires setting html_baseurl
and html_context in conf.py.

See: https://about.readthedocs.com/blog/2024/07/addons-by-default/

Signed-off-by: Heinrich Schuchardt <[email protected]>
---
 doc/conf.py | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/doc/conf.py b/doc/conf.py
index c9138a5a5d4..e79134cc3d7 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -21,6 +21,12 @@ from subprocess import check_output
 # Get Sphinx version
 major, minor, patch = sphinx.version_info[:3]
 
+# Set canonical URL from the Read the Docs Domain
+html_baseurl = os.environ.get("READTHEDOCS_CANONICAL_URL", "")
+
+# Tell Jinja2 templates the build is running on Read the Docs
+if os.environ.get("READTHEDOCS", "") == "True":
+    html_context["READTHEDOCS"] = True
 
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the
-- 
2.45.2

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