Rails/DotSeparatedKeys autofix seems to keep all dots when combining the scope with the key.

[danieldiekmeier]

When running the new Rails/DotSeparatedKeys cop, I noticed that it generates some invalid keys.

Expected behavior

I18n.t("world", scope: ["hello", "hello"])
I18n.t(".world", scope: ["hello", "hello"])

should both be transformed into:

I18n.t("hello.hello.world")

Actual behavior

I18n.t("world", scope: ["hello", "hello"])  -> I18n.t("hello.hello.world")
I18n.t(".world", scope: ["hello", "hello"]) -> I18n.t("hello.hello..world")

It looks like the Autofix smooshes together the different parts, instead of making sure to remove redundant dots.

Steps to reproduce the problem

$ echo "def x\n  I18n.t('.world', scope: ['hello', 'hello'])\nend" > example.rb
$ rubocop --auto-correct ./example.rb
$ cat example.rb

RuboCop version

$ bundle exec rubocop -V
1.29.1 (using Parser 3.1.2.0, rubocop-ast 1.18.0, running on ruby 3.0.3 arm64-darwin21)
  - rubocop-performance 1.13.3
  - rubocop-rails 2.15.0
  - rubocop-rspec 2.11.1