Part of #1971384: [META] Convert page callbacks to controllers
For instructions on how to convert a page callback into a controller, see the WSCCI Conversion Guide.
joining this issue with issue #1987850: Convert system_theme_disable() to a new style controller
Hi oenie, can you post what you have so far, we're gearing up for a sprint on all these issue connected on this meta and I'd like to help out.
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