Fix an incorrect auto-correct for StringConcatenation when concat string includes double quote and interpolation.

changelog/fix_string_concatenation_correctioon_in_handle_double_quote.md

@@ -0,0 +1 @@
+* [#9346](https://github.com/rubocop-hq/rubocop/pull/9346): Fix an incorrect auto-correct for `Style/StringConcatenation` when concat string include double quotes and interpolation. ([@k-karen][])

lib/rubocop/cop/style/string_concatenation.rb

@@ -116,7 +116,7 @@ def replacement(parts)
             parts.map do |part|
               if part.str_type?
                 if single_quoted?(part)
-                  part.value.gsub('\\') { '\\\\' }
+                  part.value.gsub(/(\\|")/, '\\\\\&')
                 else
                   part.value.inspect[1..-2]
                 end

spec/rubocop/cop/style/string_concatenation_spec.rb

@@ -190,4 +190,17 @@
       RUBY
     end
   end
+
+  context 'double quotes inside string surrounded single quotes' do
+    it 'registers an offense and corrects with double quotes' do
+      expect_offense(<<-RUBY)
+        '"bar"' + foo
+        ^^^^^^^^^^^^^ Prefer string interpolation to string concatenation.
+      RUBY
+
+      expect_correction(<<-RUBY)
+        "\\\"bar\\\"\#{foo}"
+      RUBY
+    end
+  end
 end