The generated spec_helper.rb file includes some settings that are only active if the user is only running one file:
However, the generated .rspec file now requires spec_helper very early:
At the time spec_helper.rb is loaded, rspec hasn't resolved files_to_run and it's an empty array so these settings aren't working together as intended.
I think we need to resolve files_to_run before requiring files passed by --require or make it resolve lazily when accessed so that it works in this case.
Fixed by #1289.