Auto-fix with empty else in case statement causes infinite loop ("Layout/IndentationWidth -> Layout/ElseAlignment")

[MarcPer]

Attempting auto-fix (rubocop -a) on a file with case statement using in (pattern matching) and an empty else clause causes an infinite loop.

---

Expected behavior

There shouldn't be an infinite loop. The empty else clause should be allowed.

Actual behavior

The two following offenses are detected, and the auto-correction for one contradicts the other:

Offenses:

test.rb:5:5: C: [Corrected] Layout/IndentationWidth: Use 2 (not 0) spaces for indentation.
    else
    
test.rb:5:7: C: [Corrected] Layout/ElseAlignment: Align else with in.
      else
      ^^^^

0 files inspected, 2 offenses detected, 2 offenses corrected
Infinite loop detected in <path>/test.rb and caused by Layout/IndentationWidth -> Layout/ElseAlignment

Steps to reproduce the problem

• Create a test.rb file with the following content:

x = 1
case x
in [:x, _] then puts ":x"
else
end

• Run rubocop -a test.rb.

RuboCop version

$ rubocop -V
1.35.0 (using Parser 3.1.2.1, rubocop-ast 1.21.0, running on ruby 3.1.2 arm64-darwin21)
  - rubocop-performance 1.14.3```