Trim extra displayed carriage returns in diffs and files with CRLFs

Closes #20440

2 files changed, 14 insertions, 1 deletions

diff --git a/spec/lib/gitlab/highlight_spec.rb b/spec/lib/gitlab/highlight_spec.rb
index 364532e94e3..80a9473d6aa 100644
--- a/spec/lib/gitlab/highlight_spec.rb
+++ b/spec/lib/gitlab/highlight_spec.rb
@@ -17,6 +17,18 @@ describe Gitlab::Highlight, lib: true do
       expect(lines[21]).to eq(%Q{<span id="LC22" class="line">    <span class="k">unless</span> <span class="no">File</span><span class="p">.</span><span class="nf">directory?</span><span class="p">(</span><span class="n">path</span><span class="p">)</span></span>\n})
       expect(lines[26]).to eq(%Q{<span id="LC27" class="line">    <span class="vi">@cmd_status</span> <span class="o">=</span> <span class="mi">0</span></span>\n})
     end
+
+    describe 'with CRLF' do
+      let(:branch) { 'crlf-diff' }
+      let(:blob) { repository.blob_at_branch(branch, path) }
+      let(:lines) do
+        Gitlab::Highlight.highlight_lines(project.repository, 'crlf-diff-test', 'files/whitespace')
+      end
+
+      it 'strips extra LFs' do
+        expect(lines[0]).to eq("<span id=\"LC1\" class=\"line\">test  </span>")
+      end
+    end
   end
 
   describe 'custom highlighting from .gitattributes' do
diff --git a/spec/support/test_env.rb b/spec/support/test_env.rb
index 3735abe2302..4561aa9644d 100644
--- a/spec/support/test_env.rb
+++ b/spec/support/test_env.rb
@@ -21,7 +21,8 @@ module TestEnv
     'expand-collapse-diffs' => '4842455',
     'expand-collapse-files' => '025db92',
     'expand-collapse-lines' => '238e82d',
-    'video'                 => '8879059'
+    'video'                 => '8879059',
+    'crlf-diff'             => '5938907'
   }
 
   # gitlab-test-fork is a fork of gitlab-fork, but we don't necessarily