LSP and signature file updates

[lloeki]

When working on https://github.com/dense-analysis/ale/pull/4376 I noticed that if I change RBS files (change, addition, deletion) at least some of the changes don't seem to be picked up by the LSP server.

I was wondering whether the definition files are not refreshed, and thus Steep proceeds to check with stale cached signature data.

[lloeki]

Example:

# foo.rb
class Foo
  def test(a)
    puts a
  end
end

Foo.new.test('hello')

# foo.rbs
class Foo
  # def test: (::String) -> void
end

Steps to reproduce:

• start Steep LSP server
• failure is reported: foo.rb:7:8: [error] Type ::Foo does not have method test
• uncomment def in definition
• LSP server does not update and still reports failure
• stop then start LSP server
• failure disappears