Only cache highlight results for latest MR diffs

Previously, we kept them all in the cache. We don't need the highlight results
for older diffs - if someone does view that (which is rare), we can do the
highlighting on the fly.

1 files changed, 1 insertions, 1 deletions

diff --git a/spec/models/merge_request_spec.rb b/spec/models/merge_request_spec.rb
index 7986aa31e16..4e783acbd8b 100644
--- a/spec/models/merge_request_spec.rb
+++ b/spec/models/merge_request_spec.rb
@@ -1544,7 +1544,7 @@ describe MergeRequest do
     end
 
     it "executes diff cache service" do
-      expect_any_instance_of(MergeRequests::MergeRequestDiffCacheService).to receive(:execute).with(subject)
+      expect_any_instance_of(MergeRequests::MergeRequestDiffCacheService).to receive(:execute).with(subject, an_instance_of(MergeRequestDiff))
 
       subject.reload_diff
     end