Fix find_end_line for block nodes.

[reitermarkus]

When two block nodes are in the root, e.g.

block1 do
  # ...
end

block2 do
  # ...
end

calling find_end_line on the second will return 1 instead of 7.

---

Before submitting the PR make sure the following are checked:

• The PR relates to only one subject with a clear title and description in grammatically correct, complete sentences.
• Wrote good commit messages.
• Commit message starts with [Fix #issue-number] (if the related issue exists).
• Feature branch is up-to-date with master (if not - rebase it).
• Squashed related commits together.
• Added tests.
• Ran bundle exec rake default. It executes all tests and runs RuboCop on its own code.
• Added an entry (file) to the changelog folder named {change_type}_{change_description}.md if the new code introduces user-observable changes. See changelog entry format for details.

[koic]

Can you add a test case and a changelog entry?

[reitermarkus]

Are there any existing tests for CommentsHelp? I only ran into this issue while implementing a custom cop, so not sure about the best way to test this here.

[koic]

It would be better to add a reproducible test case in any cop that mixin CommentsHelp:

$ git grep 'include CommentsHelp'
lib/rubocop/cop/layout/class_structure.rb:137:        include CommentsHelp
lib/rubocop/cop/lint/empty_conditional_body.rb:65:        include CommentsHelp
lib/rubocop/cop/lint/empty_in_pattern.rb:47:        include CommentsHelp
lib/rubocop/cop/lint/empty_when.rb:48:        include CommentsHelp
lib/rubocop/cop/style/class_methods_definitions.rb:63:        include CommentsHelp
lib/rubocop/cop/style/if_unless_modifier.rb:68:        include CommentsHelp
lib/rubocop/cop/style/multiline_ternary_operator.rb:37:        include CommentsHelp
lib/rubocop/cop/style/redundant_initialize.rb:98:        include CommentsHelp
lib/rubocop/cop/style/symbol_proc.rb:88:        include CommentsHelp

It may not be the best, but having regression tests is essential.

[reitermarkus]

Thanks, I found a cop that runs on blocks which actually has this problem.

[koic]

I left two comments. Finally, please squash the commits into one.

[koic]

Thanks!