Fix/9093 theme basic css import #14260
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Previously, if a theme defined a stylesheet, it would completely
overwrite the stylesheet list of any parent themes. This caused
inherited themes (like 'agogo' or 'traditional') to lose the
foundation 'basic.css' from the 'basic' theme.
This change:
1. Modifies Theme initialization to append inherited stylesheets
rather than replacing them.
2. Ensures stylesheets are deduplicated while preserving order.
3. Updates existing tests that relied on the previous replacement
behavior to expect the full inheritance chain.
Python 3.15's argparse is stricter with '%' sequences in version and help strings. Switching to an f-string for the version argument avoids the ValueError caused by the previous manual string formatting.
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Purpose
This PR fixes a bug where HTML themes that inherit from a parent theme would accidentally overwrite the parent's stylesheet list instead of extending it. This was particularly problematic for themes like
agogoortraditionalthat inherit from thebasictheme; they would lose the corebasic.cssstyles if they defined their own stylesheets.Changes:
sphinx/theming.pyto merge stylesheet lists from the entire inheritance chain.basic.css) while preserving the correct loading order.tests/test_theming/test_theming.pythat were previously asserting the "replacement" behavior.I have verified this fix using a reproduction script that builds a project with the
agogotheme and confirms thatbasic.cssis correctly included in the final HTML output.References