Enables auto expand diff feature flag by default

app/controllers/projects/merge_requests_controller.rb

@@ -36,7 +36,7 @@ class Projects::MergeRequestsController < Projects::MergeRequests::ApplicationCo
     push_frontend_feature_flag(:multiline_comments, @project)
     push_frontend_feature_flag(:file_identifier_hash)
     push_frontend_feature_flag(:batch_suggestions, @project, default_enabled: true)
-    push_frontend_feature_flag(:auto_expand_collapsed_diffs, @project)
+    push_frontend_feature_flag(:auto_expand_collapsed_diffs, @project, default_enabled: true)
     push_frontend_feature_flag(:hide_jump_to_next_unresolved_in_threads, @project)
   end
 

changelogs/unreleased/ph-enableAutoExpandByDefault.yml

+---
+title: Auto expand collapsed diffs when viewing diffs file-by-file
+merge_request: 38296
+author:
+type: added