Propshaft detection is load order dependant

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The Propshaft integration works without configuration but depends on the entries' Gemfile order. The detection works when the inline_svg is listed after propshaft.

The issue is caused by inline_svg determining which adapter to use in an after_initialize block and caching its value too early in the boot process when Propshaft is not ready. I found the call here:

https://github.com/jamesmartin/inline_svg/blob/1a1e2e0c1f3595a8e51a6a39727f357451d180c5/lib/inline_svg/railtie.rb#L19

Propshaft also uses an after_initialize block to finalize its configuration, and Rails keeps track of railties in their load order. That's why swapping the gems is a workaround.

A proper fix would be to evaluate asset_finder when called and once the assets are ready.