Attempt to fix offense.highlighted_area returning an incorrectly constructed range

[Earlopain]

Attempt at #12527. This is not correct yet because tests are not passing.

To be honest, I'm not sure what's wrong here. Sometimes it starts one character to the left, adding 1 all the time is not the fix since it then starts one to the right in some cases. There's some offset fuckery going on that I'm not getting behind.

If someone can give insight into why that might be, that would be appreciated. I will add changleog/tests when I've got this figured out.

---

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• 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.

[Earlopain]

Sample test case bundle exec rspec ./spec/rubocop/cli/autocorrect_spec.rb:1714. I have added a bit of debugging output in the method:

def highlighted_area
  correct_range = Parser::Source::Range.new(source_line, column, column + column_length)
  range = location.source_buffer.line_range(line)
  offset = location.begin_pos - column
  range = range.with(begin_pos: column, end_pos: column + column_length)

  pp "loc.begin_pos: #{location.begin_pos}, loc.end_pos #{location.end_pos}, loc.column: #{location.column}, loc.column_length: #{column_length}"
  pp correct_range.begin_pos - range.begin_pos
  pp correct_range.end_pos - range.end_pos
  pp correct_range.source, range.source

  range
end

example.rb:1:12: C: [Corrected] Style/MethodDefParentheses: Use def with parentheses when there are parameters.
def primes limit
+"loc.begin_pos: 11, loc.end_pos 16, loc.column: 11, loc.column_length: 5"
+0
+0
+"limit"
+"limit"
           ^^^^^
example.rb:2:24: C: [Corrected] Style/SymbolProc: Pass &:even? as an argument to select instead of a block.
  1.upto(limit).select { |i| i.even? }
-                       ^^^^^^^^^^^^^^^
+"loc.begin_pos: 40, loc.end_pos 55, loc.column: 23, loc.column_length: 15"
+0
+0
+"{ |i| i.even? }"
+"to(limit).selec"
+                      ^^^^^^^^^^^^^^^

I can tweak the positions that the source is correct but then the positions are all wrong. Haven't figured out how to get both to line up yet.

[bbatsov]

@koic Can you take a look here?