[Fix rubocop#6974] Make Layout/FirstMethodArgumentLineBreak aware o…

…f calling using `super`

Fixes rubocop#6974.

This PR makes `Layout/FirstMethodArgumentLineBreak` aware of calling using `super`.

```ruby
# example.rb
super(:foo,
  :bar
  )
```

## Before

```console
% rubocop --only Layout/FirstMethodArgumentLineBreak
Inspecting 1 file
.

1 file inspected, no offenses detected
```

## After

```console
% rubocop --only Layout/FirstMethodArgumentLineBreak
Inspecting 1 file
C

Offenses:

example.rb:1:7: C: Layout/FirstMethodArgumentLineBreak: Add a line break
before the first argument of a multi-line method argument list.
super(:foo,
      ^^^^

1 file inspected, 1 offense detected
```

CHANGELOG.md

@@ -9,6 +9,7 @@
 * Add new `Layout/HeredocArgumentClosingParenthesis` cop. ([@maxh][])
 * [#6895](https://github.com/rubocop-hq/rubocop/pull/6895): Add support for XDG config home for user-config. ([@Mange][], [@tejasbubane][])
 * Add initial autocorrection support to `Metrics/LineLength`. ([@maxh][])
+* [#6974](https://github.com/rubocop-hq/rubocop/issues/6974): Make `Layout/FirstMethodArgumentLineBreak` aware of calling using `super`. ([@koic][])
 
 ### Bug fixes
 

lib/rubocop/cop/layout/first_method_argument_line_break.rb

@@ -44,6 +44,7 @@ def on_send(node)
           check_method_line_break(node, args)
         end
         alias on_csend on_send
+        alias on_super on_send
 
         def autocorrect(node)
           EmptyLineCorrector.insert_before(node)

spec/rubocop/cop/layout/first_method_argument_line_break_spec.rb

@@ -25,6 +25,20 @@
       RUBY
     end
 
+    it 'detects the offense when using `super`' do
+      expect_offense(<<-RUBY.strip_indent)
+        super(bar,
+              ^^^ Add a line break before the first argument of a multi-line method argument list.
+          baz)
+      RUBY
+
+      expect_correction(<<-RUBY.strip_indent)
+        super(
+        bar,
+          baz)
+      RUBY
+    end
+
     context 'when using safe navigation operator', :ruby23 do
       it 'detects the offense' do
         expect_offense(<<-RUBY.strip_indent)