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.
Will work on this once #1983844: Add EntityListController and convert picture.module callbacks to routes/controllers to provide a use-case is in.
Wow this is great.
Committed a21ee2d and pushed to 8.x. Thanks!
Automatically closed -- issue fixed for 2 weeks with no activity.
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