The lockfile is completely ignored in inline mode, yet the previous
output would suggest it wasn't.

https://github.com/rubygems/rubygems/commit/763125a745

We have two representations of a source. Once used for sorting, which
should not depend on the source's state, but solely on its static
information, like remotes. Another one used for error and informational
messages, which should properly inform about the exact state of the
source when the message is printed.

This commit makes the latter be the default implementation of `to_s`, so
that error and informational messages are more accurate by default.

https://github.com/rubygems/rubygems/commit/b5f2b88957

As part of a recent bug fix where bundler was accidentally hitting the
network when not supposed to, I made some refactoring, and the commit I'm
reverting here
(https://github.com/rubygems/rubygems/commit/d74830d00bb541883377992f56818620a78930b0)
was some cleanup that those refactorings allowed according to "past me".

That was completely wrong, `bundle check` should never consider cached
gems, only installed gems, so the code that was removed was necessary.

https://github.com/rubygems/rubygems/commit/5483e98305

https://github.com/rubygems/rubygems/commit/d74830d00b

When printing sources inside these error messages, it's useful to only
consider the current state of the source. For example, when requiring
`bundler/setup`, the source shouldn't be configured to be able to hit
the network, so the error message should only mention "locally installed
gems" to make that more clear.

https://github.com/rubygems/rubygems/commit/30eb14f853

  Pick from 8dd59e3ba97eb80a599f8149f31bf40773b69dc0