application.js is added twice when :defaults expansion is redefined

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After talking to José about this, it seems the solution to the issue requires a bit of a reworking.

I am currently working on a patch which will take care of this issue but also other issues found when reading into the tests, the main problem being that javascript_include_tag allows for duplicate asset tags, which is the root cause of this issue.

Ticket reopened and patch on its way.

[state:open]

This issue can now be closed as it is resolved by https://github.com/rails/rails/commit/1363bb8f7215fadb65e9296217be2... in master.