[Fix #12265] Fix an error for Layout/MultilineMethodCallIndentation

Fixes #12265.

This PR fixes an error for `Layout/MultilineMethodCallIndentation`
when usingarithmetic operation with block inside a grouped expression.

changelog/fix_an_error_for_layout_multiline_method_call_indentation.md

@@ -0,0 +1 @@
+* [#12265](https://github.com/rubocop/rubocop/issues/12265): Fix an error for `Layout/MultilineMethodCallIndentation` when usingarithmetic operation with block inside a grouped expression. ([@koic][])

lib/rubocop/cop/layout/multiline_method_call_indentation.rb

@@ -182,7 +182,7 @@ def semantic_alignment_base(node, rhs)
           return unless rhs.source.start_with?('.', '&.')
 
           node = semantic_alignment_node(node)
-          return unless node&.loc&.selector
+          return unless node&.loc&.selector && node.loc.dot
 
           node.loc.dot.join(node.loc.selector)
         end

spec/rubocop/cop/layout/multiline_method_call_indentation_spec.rb

@@ -73,6 +73,16 @@
       RUBY
     end
 
+    it 'accepts arithmetic operation with block inside a grouped expression' do
+      expect_no_offenses(<<~RUBY)
+        (
+          a * b do
+          end
+        )
+          .c
+      RUBY
+    end
+
     it 'accepts an expression where the first method spans multiple lines' do
       expect_no_offenses(<<~RUBY)
         subject.each do |item|