Fix require_exact to work with options defined as --[no]-something

[fatkodima]

While working on rubocop/rubocop#12282 I identified that optparse does not work correctly when require_exact is set and an option with --[no-] prefix is defined. It raises invalid option when this option is provided via command line.

Example

OptionParser.new do |opts|
  opts.require_exact = true

  opts.on("-v", "--[no-]verbose", "Run verbosely") do
    # ...
  end
end

$ cli --verbose
invalid option: --verbose
For usage information, use --help

This config was introduced in #2.
cc @jeremyevans (as implementor)

[jeremyevans]

Is this related to the require_exact bug fix?

[fatkodima]

Without it we will get a no method error on nil (here https://github.com/ruby/optparse/pull/60/files#diff-efe4cf792254b968b88d74bf0c0072b5caba64bacfaa0bb43e2a019e7a339518R1645) when just calling $ cli --help.

[nobu]

I can't reproduce that failure even without this part of the change.

[fatkodima]

Reproduction test script:

# cli.rb
require "bundler/inline"

gemfile(true) do
  source "https://rubygems.org"

  git_source(:github) { |repo| "https://github.com/#{repo}.git" }

  # Activate the gem you are reporting the issue against.
  gem "optparse", github: "ruby/optparse"
end

require "optparse"

options = OptionParser.new do |opts|
  opts.require_exact = true

  opts.on("-v", "--[no-]verbose", "Run verbosely") do
    # ...
  end
end

options.parse!

▶ ruby cli.rb --help
Fetching https://github.com/ruby/optparse.git
Resolving dependencies...
/Users/fatkodima/.asdf/installs/ruby/3.2.2/lib/ruby/gems/3.2.0/bundler/gems/optparse-667ab35f593f/lib/optparse.rb:1645:in `block in parse_in_order': undefined method `include?' for nil:NilClass (NoMethodError)

            if require_exact && !sw.long.include?(arg)
                                        ^^^^^^^^^
	from /Users/fatkodima/.asdf/installs/ruby/3.2.2/lib/ruby/gems/3.2.0/bundler/gems/optparse-667ab35f593f/lib/optparse.rb:1636:in `catch'
	from /Users/fatkodima/.asdf/installs/ruby/3.2.2/lib/ruby/gems/3.2.0/bundler/gems/optparse-667ab35f593f/lib/optparse.rb:1636:in `parse_in_order'
	from /Users/fatkodima/.asdf/installs/ruby/3.2.2/lib/ruby/gems/3.2.0/bundler/gems/optparse-667ab35f593f/lib/optparse.rb:1630:in `order!'
	from /Users/fatkodima/.asdf/installs/ruby/3.2.2/lib/ruby/gems/3.2.0/bundler/gems/optparse-667ab35f593f/lib/optparse.rb:1739:in `permute!'
	from /Users/fatkodima/.asdf/installs/ruby/3.2.2/lib/ruby/gems/3.2.0/bundler/gems/optparse-667ab35f593f/lib/optparse.rb:1764:in `parse!'
	from cli.rb:22:in `<main>'