bug#62761: ruby-add-log-current-method drops some segments when singleton definition references outer module

[Dmitry Gutov]

Example:

  module M
    module N
      module C
        class D
          def C.foo
            _
          end
        end
      end
    end
  end

(ruby-add-log-current-method) currently returns "M::C.foo"

While it should return "M::N::C.foo". Patch attached.

This discovery stems from Mattias Engdegård's report (in private) about 
an ignored return value from `nreverse`.

Is this good for emacs-29?

It seems pretty safe (with decent test coverage, including the new 
test), but probably low urgency. Not a regression either.

ruby-add-log-reference-containing.diff
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