ruby-mode: Support endless singleton method definitions too

* lisp/progmodes/ruby-mode.el (ruby-endless-method-head-re):
Update to match not only 'self.' but 'xyz.' as well (bug#54702).

* test/lisp/progmodes/ruby-mode-resources/ruby.rb (Bar#foo=):
Update example.

1 files changed, 3 insertions, 1 deletions

diff --git a/test/lisp/progmodes/ruby-mode-resources/ruby.rb b/test/lisp/progmodes/ruby-mode-resources/ruby.rb
index 5636a4fc0e2..2451edaee22 100644
--- a/test/lisp/progmodes/ruby-mode-resources/ruby.rb
+++ b/test/lisp/progmodes/ruby-mode-resources/ruby.rb
@@ -533,6 +533,8 @@ class Bar
         baz,
         bar
       )
-    hello
+    def baz.full_name = "#{bar} 3"
+
+    baz
   end
 end