When no `.sprockets-manifest-xxx.json` existed, every instance of
`Sprockets::Manifest` generated their own path with their own random
filename, and since this happened before the assets were actually
precompiled, they were all empty. So the error pages didn't find the
manifest and the non-digest assets also didn't have any assets to copy.
So lets create our own instance of `Sprockets::Manifest` here, AFTER
`assets:precompile`, which then loads the manifest json that was used
during precompile, so all precompiled assets are available.
closes#8366
`Rails.application.assets` is only available when `config.assets.compile`
is true (which is false in production). So the old way with a separate
rake task doesn't work in production. But we can get the filename of the
precompiled file from `Rails.application.assets_manifest.assets`.
* snippet now in a separate JS file - compiled and uglified with the other assets
* popup gets centered in opening browser window
* publisher gets pre-filled with markdown-styled content
This allows us to reuse any CSS we have, unify
their look and unify their look with the regular
page design.
This works by instantiating ActionView and rendering
templates in a rake task.
Inspired by the errgent gem.
