Merge branch 'rubocop/enable-identical-conditional-branches-cop' into 'master'

Enable Style/IdenticalConditionalBranches Rubocop cop

## What does this MR do?

This MR enables Rubocop cop that checks for identical lines at the end of each branch of a conditional statement.

Examples:

```ruby
@bad
if condition
  do_x
  do_z
else
  do_y
  do_z
end

@good
if condition
  do_x
else
  do_y
end
do_z
```

## What are the relevant issue numbers?

#17478

See merge request !5011

1 files changed, 6 insertions, 10 deletions

diff --git a/lib/rouge/formatters/html_gitlab.rb b/lib/rouge/formatters/html_gitlab.rb
index 8c309efc7b8..3358ed6773e 100644
--- a/lib/rouge/formatters/html_gitlab.rb
+++ b/lib/rouge/formatters/html_gitlab.rb
@@ -143,18 +143,14 @@ module Rouge
               '</span>'
             end
           end
-          lines.join("\n")
-        else
-          if @linenos == 'inline'
-            lines = lines.each_with_index.map do |line, index|
-              number = index + @linenostart
-              "<span class=\"linenos\">#{number}</span>#{line}"
-            end
-            lines.join("\n")
-          else
-            lines.join("\n")
+        elsif @linenos == 'inline'
+          lines = lines.each_with_index.map do |line, index|
+            number = index + @linenostart
+            "<span class=\"linenos\">#{number}</span>#{line}"
           end
         end
+
+        lines.join("\n")
       end
 
       def span(tok, val)