0.83.0 broke this code with Style/IfUnlessModifier

[iGEL]

Expected behavior

The code should be fine, as it is with 0.82.0:

Inspecting 1 file
.

1 file inspected, no offenses detected

Actual behavior

Offenses:

test.rb:6:17: C: [Corrected] Style/IfUnlessModifier: Favor modifier if usage when having a single-line body. Another good alternative is the usage of control flow &&/||.
    _customer = if params[:customer_id]
                ^^
test.rb:6:18: C: [Corrected] Style/IfUnlessModifier: Favor modifier if usage when having a single-line body. Another good alternative is the usage of control flow &&/||.
    _customer = (if params[:customer_id]
                 ^^
test.rb:6:72: C: [Corrected] Style/IfUnlessModifier: Modifier form of if makes the line too long.
    _customer = (CustomerCell.new(Customer.find(params[:customer_id])) if params[:customer_id])
                                                                       ^^

0 files inspected, 3 offenses detected, 3 offenses corrected
Infinite loop detected in /home/me/tmp/test.rb.
/home/me/.gem/gems/rubocop-0.83.0/lib/rubocop/runner.rb:292:in `check_for_infinite_loop'
/home/me/.gem/gems/rubocop-0.83.0/lib/rubocop/runner.rb:275:in `block in iterate_until_no_changes'
/home/me/.gem/gems/rubocop-0.83.0/lib/rubocop/runner.rb:274:in `loop'
/home/me/.gem/gems/rubocop-0.83.0/lib/rubocop/runner.rb:274:in `iterate_until_no_changes'
/home/me/.gem/gems/rubocop-0.83.0/lib/rubocop/runner.rb:245:in `do_inspection_loop'
/home/me/.gem/gems/rubocop-0.83.0/lib/rubocop/runner.rb:124:in `block in file_offenses'
/home/me/.gem/gems/rubocop-0.83.0/lib/rubocop/runner.rb:148:in `file_offense_cache'
/home/me/.gem/gems/rubocop-0.83.0/lib/rubocop/runner.rb:122:in `file_offenses'
/home/me/.gem/gems/rubocop-0.83.0/lib/rubocop/runner.rb:113:in `process_file'
/home/me/.gem/gems/rubocop-0.83.0/lib/rubocop/runner.rb:92:in `block in each_inspected_file'
/home/me/.gem/gems/rubocop-0.83.0/lib/rubocop/runner.rb:91:in `each'
/home/me/.gem/gems/rubocop-0.83.0/lib/rubocop/runner.rb:91:in `reduce'
/home/me/.gem/gems/rubocop-0.83.0/lib/rubocop/runner.rb:91:in `each_inspected_file'
/home/me/.gem/gems/rubocop-0.83.0/lib/rubocop/runner.rb:78:in `inspect_files'
/home/me/.gem/gems/rubocop-0.83.0/lib/rubocop/runner.rb:39:in `run'
/home/me/.gem/gems/rubocop-0.83.0/lib/rubocop/cli/command/execute_runner.rb:21:in `execute_runner'
/home/me/.gem/gems/rubocop-0.83.0/lib/rubocop/cli/command/execute_runner.rb:13:in `run'
/home/me/.gem/gems/rubocop-0.83.0/lib/rubocop/cli/command.rb:10:in `run'
/home/me/.gem/gems/rubocop-0.83.0/lib/rubocop/cli/environment.rb:17:in `run'
/home/me/.gem/gems/rubocop-0.83.0/lib/rubocop/cli.rb:65:in `run_command'
/home/me/.gem/gems/rubocop-0.83.0/lib/rubocop/cli.rb:72:in `execute_runners'
/home/me/.gem/gems/rubocop-0.83.0/lib/rubocop/cli.rb:41:in `run'
/home/me/.gem/gems/rubocop-0.83.0/exe/rubocop:13:in `block in <top (required)>'
/usr/lib/ruby/2.7.0/benchmark.rb:308:in `realtime'
/home/me/.gem/gems/rubocop-0.83.0/exe/rubocop:12:in `<top (required)>'
/home/me/.gem/bin/rubocop:23:in `load'
/home/me/.gem/bin/rubocop:23:in `<main>'

Steps to reproduce the problem

Create test.rb with this content:

class X
  def y
    _customer = if params[:customer_id]
      CustomerCell.new(Customer.find(params[:customer_id]))
    end
  end
end

Create .rubocop.yml with this content:

Layout/LineLength:
  Max: 85
Layout/EndAlignment:
  EnforcedStyleAlignWith: variable

Run rubocop -a test.rb

RuboCop version

Broken version:

$ rubocop -V
0.83.0 (using Parser 2.7.1.2, running on ruby 2.7.0 x86_64-linux-gnu)

Good version:

$ rubocop -V                   
0.82.0 (using Parser 2.7.1.2, running on ruby 2.7.0 x86_64-linux-gnu)

Possibly related change

I haven't checked, but I assume this change could have broken this: #7872

[dmytro-savochkin]

This should be closed due to #8435.