Revert "fix Gemfile not updating for peer dependencies (#7621)"

This reverts commit 4392f1c.

bundler/lib/dependabot/bundler/update_checker/force_updater.rb

@@ -77,15 +77,6 @@ def original_dependencies
             ).parse
         end
 
-        def top_level_dependencies
-          @top_level_dependencies ||=
-            FileParser.new(
-              dependency_files: dependency_files.reject { |file| file.name == lockfile.name },
-              credentials: credentials,
-              source: nil
-            ).parse
-        end
-
         def dependencies_from(updated_deps, specs)
           # You might think we'd want to remove dependencies whose version
           # hadn't changed from this array. We don't. We still need to unlock
@@ -94,17 +85,14 @@ def dependencies_from(updated_deps, specs)
           #
           # This is kind of a bug in Bundler, and we should try to fix it,
           # but resolving it won't necessarily be easy.
+          updated_deps.filter_map do |dep|
+            original_dep =
+              original_dependencies.find { |d| d.name == dep.fetch("name") }
+            spec = specs.find { |d| d.fetch("name") == dep.fetch("name") }
 
-          # put the lead dependency first
-          index = specs.index { |dep| dep["name"] == updated_deps.first["name"] }
-          specs.unshift(specs.delete_at(index))
-          specs.filter_map do |dep|
-            next unless top_level_dependencies.find { |d| d.name == dep.fetch("name") }
-
-            original_dep = original_dependencies.find { |d| d.name == dep.fetch("name") }
-            next if dep.fetch("version") == original_dep.version
+            next if spec.fetch("version") == original_dep.version
 
-            build_dependency(original_dep, dep)
+            build_dependency(original_dep, spec)
           end
         end
 

bundler/spec/dependabot/bundler/update_checker/force_updater_spec.rb

@@ -215,50 +215,5 @@
           to raise_error(Dependabot::DependencyFileNotResolvable)
       end
     end
-
-    context "when peer dependencies in the Gemfile should update together" do
-      let(:dependency_files) { bundler_project_dependency_files("top_level_update") }
-      let(:target_version) { "19.4" }
-      let(:dependency_name) { "octicons" }
-      let(:requirements) do
-        [{
-          file: "Gemfile",
-          requirement: "~> 19.2",
-          groups: [:default],
-          source: nil
-        }]
-      end
-      let(:expected_requirements) do
-        [{
-          file: "Gemfile",
-          requirement: "~> 19.4",
-          groups: [:default],
-          source: nil
-        }]
-      end
-
-      it "updates all dependencies" do
-        expect(updated_dependencies).to eq(
-          [
-            Dependabot::Dependency.new(
-              name: "octicons",
-              version: "19.4.0",
-              previous_version: "19.2.0",
-              requirements: expected_requirements,
-              previous_requirements: requirements,
-              package_manager: "bundler"
-            ),
-            Dependabot::Dependency.new(
-              name: "octicons_helper",
-              version: "19.4.0",
-              previous_version: "19.2.0",
-              requirements: expected_requirements,
-              previous_requirements: requirements,
-              package_manager: "bundler"
-            )
-          ]
-        )
-      end
-    end
   end
 end