Small fixes from code review. #3945

app/controllers/projects/merge_requests_controller.rb

@@ -104,7 +104,7 @@ class Projects::MergeRequestsController < Projects::ApplicationController
     @commit = @merge_request.last_commit
     @first_commit = @merge_request.first_commit
     @diffs = @merge_request.compare_diffs
-    @diff_refs = [@merge_request.target_sha, @merge_request.source_branch]
+    @diff_refs = [@merge_request.target_sha, @merge_request.source_sha]
     @ci_commit = @merge_request.ci_commit
     @statuses = @ci_commit.statuses if @ci_commit

app/helpers/blob_helper.rb

@@ -11,14 +11,14 @@ module BlobHelper
   end
   def highlight(blob_name, blob_content, nowrap: false, continue: false)
-    @formatter ||= rouge_formatter(nowrap: nowrap)
+    formatter = rouge_formatter(nowrap: nowrap)
     begin
       @lexer ||= Rouge::Lexer.guess(filename: blob_name, source: blob_content).new
-      result = @formatter.format(@lexer.lex(blob_content, continue: continue)).html_safe
+      result = formatter.format(@lexer.lex(blob_content, continue: continue)).html_safe
     rescue
       @lexer = Rouge::Lexers::PlainText
-      result = @formatter.format(@lexer.lex(blob_content)).html_safe
+      result = formatter.format(@lexer.lex(blob_content)).html_safe
     end
     result

lib/gitlab/diff/highlight.rb

@@ -125,10 +125,6 @@ module Gitlab
           lines.map! { |line| " #{line}" }
         end
       end
-
-      def submodules
-        @submodules ||= diff_repository.raw_repository.submodules(diff_new_ref).keys
-      end
     end
   end
 end