Move Furo init code to normal top level, not in config-inited

src/qiskit_sphinx_theme/__init__.py

@@ -68,13 +68,13 @@ def remove_thebe_if_not_needed(
 
 
 def activate_themes(app: sphinx.application.Sphinx, config: sphinx.config.Config) -> None:
-    if config.html_theme == "qiskit":
-        app.add_js_file("scripts/qiskit-sphinx-theme.js")
-        furo_py.setup(app)
-    else:
+    if config.html_theme == "qiskit_sphinx_theme":
         # Sphinx 6 stopped including jQuery by default. Our Pytorch theme depend on jQuery,
         # so activate it for our users automatically.
         app.setup_extension("sphinxcontrib.jquery")
+        return
+
+    app.add_js_file("scripts/qiskit-sphinx-theme.js")
 
 
 # See https://www.sphinx-doc.org/en/master/development/theming.html
@@ -90,6 +90,9 @@ def setup(app: sphinx.application.Sphinx) -> dict[str, bool]:
     previous_releases.setup(app)
     translations.setup(app)
 
+    # While this runs for Pytorch too, we early exit in the relevant functions with Pytorch.
+    furo_py.setup(app)
+
     app.add_html_theme("qiskit_sphinx_theme", _get_theme_absolute_path("pytorch"))
     app.add_html_theme("qiskit", _get_theme_absolute_path("theme/qiskit-sphinx-theme"))
 

src/qiskit_sphinx_theme/furo_py/__init__.py

@@ -170,6 +170,11 @@ def _html_page_context(
     context: Dict[str, Any],
     doctree: Any,
 ) -> None:
+    # QISKIT CHANGE: start.
+    if app.config.html_theme == "qiskit_sphinx_theme":
+        return None
+    # QISKIT CHANGE: end.
+
     if not isinstance(app.builder, StandaloneHTMLBuilder):
         raise Exception(
             "Furo is being used with a non-HTML builder. "
@@ -228,6 +233,11 @@ def _html_page_context(
 
 
 def _builder_inited(app: sphinx.application.Sphinx) -> None:
+    # QISKIT CHANGE: start.
+    if app.config.html_theme == "qiskit_sphinx_theme":
+        return None
+    # QISKIT CHANGE: end.
+
     if "furo" in app.config.extensions:
         raise Exception(
             "Did you list 'furo' in the `extensions` in conf.py? "
@@ -384,6 +394,11 @@ def _overwrite_pygments_css(
     app: sphinx.application.Sphinx,
     exception: Optional[Exception],
 ) -> None:
+    # QISKIT CHANGE: start.
+    if app.config.html_theme == "qiskit_sphinx_theme":
+        return None
+    # QISKIT CHANGE: end.
+
     if exception is not None:
         return