auto-gen-config generates incorrect config for Layout/SpaceBeforeBlockBraces

[ikaronen-relex]

When running rubocop --auto-gen-config with default settings on a large legacy project, the generated .rubocop-todo.yml does not correctly suppress all found offenses, so that a subsequent RuboCop inspection using the generated config does not pass.

The problem seems to be with the Layout/SpaceBeforeBlockBraces cop, for which the following unexpected config entry is generated:

# Offense count: 210
# This cop supports safe autocorrection (--autocorrect).
# Configuration parameters: EnforcedStyle.
# SupportedStyles: space, no_space
# SupportedStylesForEmptyBraces: space, no_space
Layout/SpaceBeforeBlockBraces:
  EnforcedStyleForEmptyBraces: no_space

This generated config is particularly strange since our recommended (and mostly followed) Ruby code style in fact mandates spaces before both empty and non-empty block braces, although we do have a few dozen Ruby code files (out of more than 2000) that currently violate this rule.

Manually editing .rubocop-todo.yml to replace EnforcedStyleForEmptyBraces: no_space with Enabled: false does make a subsequent rubocop inspection pass, but rubocop --regenerate-todo still undoes this manual change.

RuboCop version

I am using RuboCop 1.60.1 on JRuby 9.4.5.0. Running rubocop -V prints:

1.60.1 (using Parser 3.3.0.4, rubocop-ast 1.30.0, running on jruby 3.1.4) [java]