Fix a false positive for Layout/ClosingParenthesisIndentation

CHANGELOG.md

@@ -10,6 +10,7 @@
 
 * [#6254](https://github.com/rubocop-hq/rubocop/issues/6254): Fix `Layout/RescueEnsureAlignment` for non-local assignments. ([@marcotc][])
 * [#6648](https://github.com/rubocop-hq/rubocop/issues/6648): Fix auto-correction of `Style/EmptyLiteral` when `Hash.new` is passed as the first argument to `super`. ([@rrosenblum][])
+* [#6351](https://github.com/rubocop-hq/rubocop/pull/6351): Fix a false positive for `Layout/ClosingParenthesisIndentation` when first argument is multiline. ([@antonzaytsev][])
 
 ## 0.63.1 (2019-01-22)
 
@@ -3773,6 +3774,7 @@
 [@tom-lord]: https://github.com/tom-lord
 [@bayandin]: https://github.com/bayandin
 [@nadiyaka]: https://github.com/nadiyaka
+[@antonzaytsev]: https://github.com/antonzaytsev
 [@amatsuda]: https://github.com/amatsuda
 [@Intrepidd]: https://github.com/Intrepidd
 [@Ruffeng]: https://github.com/Ruffeng

lib/rubocop/cop/layout/closing_parenthesis_indentation.rb

@@ -147,7 +147,7 @@ def expected_column(left_paren, elements)
             left_paren.column
           else
             source_indent = processed_source
-                            .line_indentation(last_argument_line(elements))
+                            .line_indentation(first_argument_line(elements))
             new_indent    = source_indent - indentation_width
 
             new_indent < 0 ? 0 : new_indent
@@ -161,9 +161,9 @@ def all_elements_aligned?(elements)
             .count == 1
         end
 
-        def last_argument_line(elements)
+        def first_argument_line(elements)
           elements
-            .last
+            .first
             .loc
             .first_line
         end

spec/rubocop/cop/layout/closing_parenthesis_indentation_spec.rb

@@ -500,6 +500,27 @@ def some_method()
     end
   end
 
+  context 'method call with first multiline arg on new line' do
+    it 'accepts ) on the same level as ( with args on same line' do
+      expect_no_offenses(<<-RUBY.strip_indent)
+        where(
+          "multiline
+           condition", second_arg
+        )
+      RUBY
+    end
+
+    it 'accepts ) on the same level as ( with second arg on new line' do
+      expect_no_offenses(<<-RUBY.strip_indent)
+        where(
+          "multiline
+           condition",
+          second_arg
+        )
+      RUBY
+    end
+  end
+
   it 'accepts begin nodes that are not grouped expressions' do
     expect_no_offenses(<<-RUBY.strip_indent)
       def a