Symbol Arrays with spaces are not excluded by --auto-gen-config

[Skipants]

If you run rubocop --auto-gen-config against a codebase that contains a symbol array with spaces, eg.:

%w[Paris Sydney New\ York]

the offense is not added to rubocop_todo.yml . Subsequent rubocop runs will always have an offense on this array.

Expected behavior

The file containing the array should be excluded under the Style/WordArray cop in rubocop_todo.yml

Actual behavior

The file is not excluded.

Steps to reproduce the problem

This can be reproduced with this spec:

diff --git a/spec/rubocop/cli/auto_gen_config_spec.rb b/spec/rubocop/cli/auto_gen_config_spec.rb
index 0691669b4..240a0bfa2 100644
--- a/spec/rubocop/cli/auto_gen_config_spec.rb
+++ b/spec/rubocop/cli/auto_gen_config_spec.rb
@@ -300,6 +300,31 @@ RSpec.describe 'RuboCop::CLI --auto-gen-config', :isolated_environment do # rubo
       end
     end
 
+    it 'excludes the complex array when the style is mixed for Style/WordArray' do
+      create_file(
+        'example1.rb',
+        [
+          '# frozen_string_literal: true',
+          '',
+          '%w[France Australia USA] +',
+          '  %w[Paris Sydney New\ York]'
+        ]
+      )
+
+      expect(cli.run(['--auto-gen-config'])).to eq(0)
+      expect(File.readlines('.rubocop_todo.yml')[8..-1].join)
+        .to eq(<<~YAML)
+          # Offense count: 1
+          # Cop supports --auto-correct.
+          # Configuration parameters: MinSize, WordRegex.
+          # SupportedStyles: percent, brackets
+          Style/WordArray:
+            EnforcedStyle: percent
+            Exclude:
+              - example1.rb
+        YAML
+    end
+
     it 'overwrites an existing todo file' do
       create_file('example1.rb', ['# frozen_string_literal: true',
                                   '',

The spec should pass, but instead it fails with the diff showing that the following is missing:

-            Exclude:
-              - example1.rb

RuboCop version

Issue was encountered in app with the following version:

➜  finbot (dependabot/bundler/rubocop-1.21.0) ✗ be rubocop -V
1.21.0 (using Parser 3.0.2.0, rubocop-ast 1.12.0, running on ruby 2.5.7 x86_64-darwin19)

Spec was run against rubocop/master. HEAD at the time was 8b5d234.