1. When every issue has a relative position set, we don't need to
   perform any updates, or calculate the maximum position in the parent.
2. If we do need to calculate the maximum position in the parent, many
   parents (specifically, groups with lots of projects) leads to a slow
   query where only the index on issues.relative_position is used, not
   the index on issues.project_id. Adding the GROUP BY forces Postgres
   to use both indices.

Explicitly set locale fallbacks

Closes #54274

See merge request gitlab-org/gitlab-ce!23271

Rails5 deprecation: :nothing option is deprecated, Use head method to respond with empty response body.

See merge request gitlab-org/gitlab-ce!23311

Correctly styles tags in jobs sidebar

Closes #54391

See merge request gitlab-org/gitlab-ce!23319

The tags were using the `label` class
instead of `bagde` which is the new BS class

Allow commenting to resolved non-diff discussions

Closes #54330

See merge request gitlab-org/gitlab-ce!23279

Add support for custom highlighting slash commands via warning flags

See merge request gitlab-org/gitlab-ce!23277

Rails5: env is deprecated and will be removed from Rails 5.1

Closes #54384

See merge request gitlab-org/gitlab-ce!22626

Clear BatchLoader context between Sidekiq jobs

Closes #53079

See merge request gitlab-org/gitlab-ce!23308

Update Runner Chart to 0.1.38

See merge request gitlab-org/gitlab-ce!23304

Include wildcard for `gitlab:assets:compile` only parameter

See merge request gitlab-org/gitlab-ce!23305

Documentation: Correct blocked SMTP ports for GKE

See merge request gitlab-org/gitlab-ce!23275

Add specs for entities autocomplete

Closes #48534

See merge request gitlab-org/gitlab-ce!23250

More env vars for group & project names in QA

See merge request gitlab-org/gitlab-ce!23303

Made diff file headers sticky

Closes #48816

See merge request gitlab-org/gitlab-ce!23249

This will help with https://gitlab.com/gitlab-org/gitlab-qa/issues/349
as we need to use much shorter project and group names for HTTPS to work

Add rails version to all migrations

Closes #54098

See merge request gitlab-org/gitlab-ce!23057

Show toggle tree button on merge request commits

Closes #53019

See merge request gitlab-org/gitlab-ce!23238

Limit `gitlab:assets:compile` job to branches and tags

Closes #54361

See merge request gitlab-org/gitlab-ce!23302

Fix typos occured to occurred

See merge request gitlab-org/gitlab-ce!23105

Resolve "`fetch-assets` job times out so `package-and-qa` jobs can't complete"

Closes #54293

See merge request gitlab-org/gitlab-ce!23267

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/48816

DB schema generated by a migration may look different in
rails 4 and 5 (because rails 5 may use different default values).
For this reason it's important to explicitly set for which rails
version a migration was written for.

See https://stackoverflow.com/questions/35929869/activerecordmigration-deprecation-warning-asks-for-rails-version-but-im-no/35930912#35930912

When switching to rails 5, we added migration version to all migration
classes. This patch makes it possible to run versioned migrations
also with rails 4

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/53019

Fix markdown to render correctly

See merge request gitlab-org/gitlab-ce!23221

Remove broken link that 404s and has no alternative

See merge request gitlab-org/gitlab-ce!23295

SystemCheck: Use a more reliable way to detect current Ruby version

Closes #46950

See merge request gitlab-org/gitlab-ce!23291

Revert "Merge branch 'revert-e2aa2177' into 'master'"

Closes #54267

See merge request gitlab-org/gitlab-ce!23237

Add cop prohibiting params argument in url_for

Closes #47986

See merge request gitlab-org/gitlab-ce!23115