converge_locked_specs

# File lib/bundler/definition.rb, line 737
    def converge_locked_specs
      deps = []

      # Build a list of dependencies that are the same in the Gemfile
      # and Gemfile.lock. If the Gemfile modified a dependency, but
      # the gem in the Gemfile.lock still satisfies it, this is fine
      # too.
      @dependencies.each do |dep|
        locked_dep = @locked_deps[dep.name]

        # If the locked_dep doesn't match the dependency we're looking for then we ignore the locked_dep
        locked_dep = nil unless locked_dep == dep

        if in_locked_deps?(dep, locked_dep) || satisfies_locked_spec?(dep)
          deps << dep
        elsif dep.source.is_a?(Source::Path) && dep.current_platform? && (!locked_dep || dep.source != locked_dep.source)
          @locked_specs.each do |s|
            @unlock[:gems] << s.name if s.source == dep.source
          end

          dep.source.unlock! if dep.source.respond_to?(:unlock!)
          dep.source.specs.each {|s| @unlock[:gems] << s.name }
        end
      end

      unlock_source_unlocks_spec = Bundler.feature_flag.unlock_source_unlocks_spec?

      converged = []
      @locked_specs.each do |s|
        # Replace the locked dependency's source with the equivalent source from the Gemfile
        dep = @dependencies.find {|d| s.satisfies?(d) }
        s.source = (dep && dep.source) || sources.get(s.source)

        # Don't add a spec to the list if its source is expired. For example,
        # if you change a Git gem to RubyGems.
        next if s.source.nil?
        next if @unlock[:sources].include?(s.source.name)

        # XXX This is a backwards-compatibility fix to preserve the ability to
        # unlock a single gem by passing its name via `--source`. See issue #3759
        # TODO: delete in Bundler 2
        next if unlock_source_unlocks_spec && @unlock[:sources].include?(s.name)

        # If the spec is from a path source and it doesn't exist anymore
        # then we unlock it.

        # Path sources have special logic
        if s.source.instance_of?(Source::Path) || s.source.instance_of?(Source::Gemspec)
          other_sources_specs = begin
            s.source.specs
          rescue PathError, GitError
            # if we won't need the source (according to the lockfile),
            # don't error if the path/git source isn't available
            next if @locked_specs.
                    for(requested_dependencies, [], false, true, false).
                    none? {|locked_spec| locked_spec.source == s.source }

            raise
          end

          other = other_sources_specs[s].first

          # If the spec is no longer in the path source, unlock it. This
          # commonly happens if the version changed in the gemspec
          next unless other

          deps2 = other.dependencies.select {|d| d.type != :development }
          runtime_dependencies = s.dependencies.select {|d| d.type != :development }
          # If the dependencies of the path source have changed, unlock it
          next unless runtime_dependencies.sort == deps2.sort
        end

        converged << s
      end

      resolve = SpecSet.new(converged)
      expanded_deps = expand_dependencies(deps, true)
      @locked_specs_incomplete_for_platform = !resolve.for(expanded_deps, @unlock[:gems], true, true)
      resolve = resolve.for(expanded_deps, @unlock[:gems], false, false, false)
      diff    = nil

      # Now, we unlock any sources that do not have anymore gems pinned to it
      sources.all_sources.each do |source|
        next unless source.respond_to?(:unlock!)

        unless resolve.any? {|s| s.source == source }
          diff ||= @locked_specs.to_a - resolve.to_a
          source.unlock! if diff.any? {|s| s.source == source }
        end
      end

      resolve
    end