Style/StringConcatenation autocorrect doesn't properly escape double quotes when concatenated via single quotes

[joe-p]

Expected Behavior

When Rubocop encounters '"' + "foo" + '"' it should be autocorrected to '"foo"'

Actual Behavior

When Rubocop 1.1.0 encounters '"' + "foo" + '"' it currently autocorrects to ""foo"" thus leading to a syntax error:

test.rb:3:3: C: [Corrected] Style/StringConcatenation: Prefer string interpolation to string concatenation.
p '"' + "foo" + '"'
  ^^^^^^^^^^^^^^^^^
test.rb:3:5: E: Lint/Syntax: unexpected token tIDENTIFIER
(Using Ruby 2.4 parser; configure using TargetRubyVersion parameter, under AllCops)
p ""foo""

Steps to reproduce the problem

Create a Ruby file with the following line and run rubocop -A in its directory
'"' + "foo" + '"'

RuboCop version

$ rubocop -V
1.1.0 (using Parser 2.7.2.0, rubocop-ast 1.1.0, running on ruby 2.7.2 x86_64-linux)

Note

This is a bug specific to double quotes in single quotes. "\"" + 'foo' + "\"" is properly autocorrected to '"foo"'.

[marcandre]

Agreed.

It should also handle '"' + "'" and either correct using %Q{...} or not correct at all.

[mfbmina]

I couldn't reproduce on the master branch. Maybe #8893 or #8830 fixed it.